The Internet, mobile phones and iPads are part of our lives now. Technology is greatly affecting all ways of our lives, from the ways we work to the ways we play. And it even causes a number of social problems such as cloning humans.

We have had lots of technology and it has changed our lives a lot. There is no doubt that humans will continue to use more and more technology. Here are some examples of modern technology that will change our ideas and will affect our lives greatly.

Global Positioning System (GPS) (全球定位系统)

It’s a system that uses radio signals from satellites to show exact (精确的) information. It tells you where the user is on the earth in all weather conditions. It’s made up of three parts: satellites, control equipments (设备) on land and receivers.

Space Technology

Russian and American scientists have worked together for the International Space Station (ISS) for a long time. They hope the ISS will provide a long-lasting lab. Such a lab will bring humans limitless (无限的) advantages. It’s even hoped that one day space technology will take humans to their new houses in space.

Underwater Robot

Hercules is a kind of underwater robot with some high technology equipments. It will be used to search for ancient ships which were destroyed into the deep sea during their journey long ago.

The world is changing so quickly that it’s hard for us to catch up with all the new inventions because they seem to come out every month. It’s important for us to learn about new technology and the role that it plays in our lives. So we should be willing to accept modern technology, or we will fall behind the times.

1.                   can tell you where the user is on the earth exactly.

A. Satellites                       B. Receivers

C. Global Positioning System            D. Underwater Robot

2.According to the passage, which is NOT true about the ISS?

A. It has carried people to other planets.

B. It will provide a long-lasting lab for us.

C. Russia and America are working for it.

D. Humans will get a lot of advantages from it.

3.Hercules is used to                   .

A. save lives in the sea

B. take pictures in the sea

C. repair the broken ships 

D. look for the ancient ships in the sea

4.From the passage, we know that                   .

A. the use of GPS is affected by the weather conditions

B. it’s very important for us to learn about new technology

C. it’s easy for us to catch up with all the new inventions

D. technology brings us many advantages such as cloning humans

5.What is the purpose of the passage?

A. To help us study some new technology.

B. To tell us technology is changing the world.

C. To help solve the problems that technology causes.

D. To remind us the advantages of technology are limitless.

The Internet, mobile phones and Ipads are part of our lives now. Technology is greatly affecting all ways of our lives, from the ways we work to the ways we play. And it even causes a number of social problems such as cloning humans.

　　We have had lots of technology and it has changed our lives a lot. There is no doubt that humans will continue to use more and more technology. Here are some examples of modern technology that will change our ideas and will affect our lives greatly.

　　Global positioning system (GPS) (全球定位系统)

　　It’s a system that uses radio signals from satellites to show exact(精确地) information. It tells you where the user is on the earth in all weather conditions. It’s made up of three parts: satellites, control equipments (设备) on land and receivers.

　　Space Technology

　　Russian and American scientists have worked together for the international Space Station (ISS) for a long time. They hope the ISS will provide a long-lasting lab. Such a lab will bring humans limitless(无限的) advantages. It’s even hoped that one day space technology will take humans to their new houses in space.

Underwater Robot

Hercules is a kind of underwater robot with some high technology equipments. It will be used to search for ancient ships which were destroyed into the deep sea during their journey long ago.

The world is changing so quickly that it’s hard for us to catch up with all the new inventions because they seem to come out every month. It’s important for us to learn about new technology and the role that it plays in our lives. So we should be willing to accept modern technology, or we will fall behind the times.

1.______ can tell you where the user is on the earth exactly.

A．Satellites                              B．Receivers

C．Global Positioning System                 D．Underwater Robot

2.According to the passage, which is NOT true about the ISS?

A．It has carried people to other planets.

B．It will provide a long-lasting lab for us.

C．Russian and American are working for it.

D．Humans will get a lot of advantages from it.

3.Hercules is used to ______.

A．save lives in the sea                     B．take picture in the sea

C．repair the broken ships                   D．look for the ancient ships in the sea

4.From the passage, we know that ______.

A．the use of GPS is affected by the weather conditions

B．it’s very important for us to learn about new technology

C．it’s easy for us to catch up with all the new inventions

D．technology brings us many advantages such as cloning humans

5.What is the purpose of the passage?

A．To help us study some new technology.

B．To tell us technology is changing the world.

C．To help solve the problems that technology causes.

D．To remind us the advantages of technology are limitless.

The Internet, mobile phones and Ipads are part of our lives now. Technology is greatly affecting all ways of our lives, from the ways we work to the ways we play. And it even causes a number of social problems such as cloning humans.
　　We have had lots of technology and it has changed our lives a lot. There is no doubt that humans will continue to use more and more technology. Here are some examples of modern technology that will change our ideas and will affect our lives greatly.
　　Global positioning system (GPS) (全球定位系统)
　　It’s a system that uses radio signals from satellites to show exact(精确地) information. It tells you where the user is on the earth in all weather conditions. It’s made up of three parts: satellites, control equipments (设备) on land and receivers.
　　Space Technology
　　Russian and American scientists have worked together for the international Space Station (ISS) for a long time. They hope the ISS will provide a long-lasting lab. Such a lab will bring humans limitless(无限的) advantages. It’s even hoped that one day space technology will take humans to their new houses in space.
Underwater Robot
Hercules is a kind of underwater robot with some high technology equipments. It will be used to search for ancient ships which were destroyed into the deep sea during their journey long ago.
The world is changing so quickly that it’s hard for us to catch up with all the new inventions because they seem to come out every month. It’s important for us to learn about new technology and the role that it plays in our lives. So we should be willing to accept modern technology, or we will fall behind the times.
【小题1】______ can tell you where the user is on the earth exactly.

完成句子：根据所给汉语完成下列句子。共5小题。
【小题1】Oil _____________ (用完)，we can’t make cakes tonight．
【小题2】The man said that three monkeys _______________(逃跑)the local zoo yesterday．
【小题3】American scientists have found out at least 6，000，000，000 tons sea ice __________(组成) part of the moon
【小题4】We Chinese ____________ (为…骄傲)the teenagers who died for saving people in Jingzhou．
【小题5】Most girls ______________ (害怕)the dark．

完成句子：根据所给汉语完成下列句子。共5小题。

1.Oil _____________ (用完)，we can’t make cakes tonight．

2.The man said that three monkeys _______________(逃跑)the local zoo yesterday．

3.American scientists have found out at least 6，000，000，000 tons sea ice __________(组成) part of the moon

4.We Chinese ____________ (为…骄傲)the teenagers who died for saving people in Jingzhou．

5.Most girls ______________ (害怕)the dark．

The Internet, mobile phones and iPads are parts of our lives now. Technology is greatly affecting all ways of our lives, from the ways we work to the ways we play. And it even causes a number of social problems such as cloning (克隆) humans.

    We have had lots of technology and it has changed our lives a lot. We are sure that humans will continue to use more and more technology. Here are some examples of modern technology that will change our ideas and will affect our lives greatly.

    Global Positioning System (GPS) (全球定位系统)

    It's a system that uses radio signals from satellites to show exact (精确的) information.   It tells you where the user is on the earth in all weather conditions.  It's made up of three parts: satellites, control equipments (设备) on land and receivers.

    Space Technology

    Russian and American scientists have worked together for the International Space Station, (ISS) for a long time. They hope the ISS will provide a long-lasting lab. Such a lab will bring humans limitless (无限的) advantages. It's even hoped that one day space technology will take humans to their new houses in space.

    Underwater Robot

    Hercules is a kind of underwater robot with some high technology equipments. It will be used to search for ancient ships which were destroyed into the deep sea during their journey long ago.

    The world is changing so quickly that it's hard for us to catch up with all the new inventions because they seem to come out every month. It's important for us to learn about new technology and the role that it plays in our lives. So we should be willing to accept modem technology, or we will fall behind the times.

1. _______ can tell you where the user is on the earth exactly.

A. Satellites                                                  B. Receivers

C. Global Positioning System                     D. Underwater Robot

2. According to the passage, which is NOT true about the ISS?

A. It has carried people to other planets.

B. It will provide a long-lasting lab for us.

C. Russia and America are working for it.

D. Humans will get a lot of advantages from it.

3. Hercules is used to_______.

A. save lives in the sea                              

B. take pictures in the sea

C. repair the broken ships              

D. look for the ancient ships in the sea

4. What is the purpose of the passage?

A. To help us study some new technology.

B. To tell us technology is changing the world.

C. To help solve the problems that technology causes.

D. To remind us the advantages of technology are limitless.

The Internet, mobile phones and iPads are part of our lives now. Technology is greatly affecting all ways of our lives, from the ways we work to the ways we play. And it even causes a number of social problems such as cloning humans.
We have had lots of technology and it has changed our lives a lot. There is no doubt that humans will continue to use more and more technology. Here are some examples of modern technology that will change our ideas and will affect our lives greatly.
Global Positioning System (GPS) (全球定位系统)

It’s a system that uses radio signals from satellites to show exact (精确的) information. It tells you where the user is on the earth in all weather conditions. It’s made up of three parts: satellites, control equipments (设备) on land and receivers.
Space Technology

Russian and American scientists have worked together for the International Space Station (ISS) for a long time. They hope the ISS will provide a long-lasting lab. Such a lab will bring humans limitless (无限的) advantages. It’s even hoped that one day space technology will take humans to their new houses in space.

Underwater Robot
Hercules is a kind of underwater robot with some high technology equipments. It will be used to search for ancient ships which were destroyed into the deep sea during their journey long ago.
The world is changing so quickly that it’s hard for us to catch up with all the new inventions because they seem to come out every month. It’s important for us to learn about new technology and the role that it plays in our lives. So we should be willing to accept modern technology, or we will fall behind the times.
【小题1】                  can tell you where the user is on the earth exactly.

完成句子：根据所给汉语完成下列句子

76．Oil _____________ (用完)，we can’t make cakes tonight．

77．The man said that three monkeys _______________(逃跑)the local zoo yesterday．

78．American scientists have found out at least 6，000，000，000 tons sea ice __________(组成)

  part of the moon

79．We Chinese ____________ (为…骄傲)the teenagers who died for saving people in Jingzhou．

80．Most girls ______________ (害怕)the dark．

　　French doctors and American scientists have reported doing an operation(手术) in which the doctor was outside the operating room. This kind of operation is known as robotic operation.

　　Doctor Marescaux did the operation in an office in New York City last month, while a sixty-eight-year-old woman patient was in a hospital in Strasbourg, France. A doctor in Strasbourg got the patient ready. He placed medical tools and a small video camera in her stomach area(腹部). Doctor Marescaux in New York watched the patient on a video screen. Then he used the computer to send messages to the robot machine.

　　The robot moved the tools that cut the woman's gallbladder(胆囊) away. The woman got well soon after the operation and left the hospital two days later. Experts say the main problem with such a robotic operation is based on high-speed telecommunications(通讯系统) between the doctor and the robot. Technology must be able to send a doctor's order to a robot to move the tool quickly.

　　Experts also say a successful robotic operation will improve an operation. For example, the robot can make much smaller movements(动作) than a person can. A robot machine can turn tools in ways that a doctor's hand cannot.

　　Doctors say such a robotic operation will make possible safer and better operations in the future. They say it will improve doctor training. It will also mean that doctors could do an operation on people in dangerous places far away. And it could mean that people could have operations done by top doctors without having to travel to the city where the doctors work.

1．“Robotic operation” means“________”.

[　　]

A．a special kind of robot invented by doctors

B．an operation done far away

C．an operation done with the help of a robot

D．something done to mend a robot

2．We use the robot in the operation because ________.

[　　]

A．it can send messages in a high speed

B．even a top doctor can't do the operation himself

C．it can make the operation safer and better

D．operations can be done without any doctors

3．If we want to use the robot in the operation, we must solve the problem of ________.

[　　]

A．top doctors

B．smaller movements

C．doctor training

D．high-speed telecommunications

4．If the smaller movement can't be done by doctors in the operation, we may use ________ to solve it.

[　　]

5．Which of the following is NOT RIGHT?

[　　]

A．Robotic operation is good for doctor training.

B．Robotic operation has been used in the USA.

C．Experts speak highly of robotic operation.

D．The robot is used to watch the patient clearly.

Bad teeth，a heavier body．．．and now，weaker bones（骨头）．Recently American scientists have found another bad thing about cola--it's bad for our bones，especially women's bones．

Well，if cola is bad for us，how about energy drinks（功能饮料）? Energy drinks look cool．Their makers say they give you energy and make you better at sports．So，many students drink them before exams to help them stay awake．

But wait．To keep you awake，most energy drinks have a lot of caffeine（咖啡因）．They are like a strong cup of coffee or tea．If you drink a lot of them，Your heart will beat faster．You will feel nervous．You could also have sleeping problems and find it hard to live without them．Amanda Smith is a 16-year-old US junior high school student．She drinks one or more energy drinks every day．She started to do this a year ago before she danced．But now，Smith says，“I drink them whenever I feel weak or before a test．I cannot help drinking them．I find I'm addicted to them．”

The energy you get from the drinks helps for only a short time．You may feel good for an hour or so，but then you'll feel worse than before．

1．The main topic of this passage is ________．

A．how good energy drinks are                      B．ways to make bones strong

C．how energy drinks are made                       D．how harmful energy drinks are

2．We can learn from the first paragraph（第一段）that drinking cola ________．

A．helps lose weight                                     B．does harm to teeth and bones

C．keeps people healthy                                   D．helps kids grow tall

3．Why do people drink energy drinks?

A．Because they are said to make people energetic．

B．Because they are not expensive to buy．

C．Because they may make people's hearts stronger．

D．Because they may make people feel weak．

4．Which of the following statements is NOT true about energy drinks?

A．They can keep people awake．

B．They can make people feel good for some time．

C．They won't cause sleeping problems．

D．They are like a strong cup of coffee or tea．

5．What does the underlined word “addicted” mean in Chinese?

A．喜欢的                B．上瘾的                C．感兴趣的            D．紧张的

The Internet, mobile phones and iPads are part of our lives now. Technology is greatly affecting all ways of our lives, from the ways we work to the ways we play. And it even causes a number of social problems such as cloning humans.
We have had lots of technology and it has changed our lives a lot. There is no doubt that humans will continue to use more and more technology. Here are some examples of modern technology that will change our ideas and will affect our lives greatly.
Global Positioning System (GPS) (全球定位系统)

It’s a system that uses radio signals from satellites to show exact (精确的) information. It tells you where the user is on the earth in all weather conditions. It’s made up of three parts: satellites, control equipments (设备) on land and receivers.
Space Technology

Russian and American scientists have worked together for the International Space Station (ISS) for a long time. They hope the ISS will provide a long-lasting lab. Such a lab will bring humans limitless (无限的) advantages. It’s even hoped that one day space technology will take humans to their new houses in space.

Underwater Robot
Hercules is a kind of underwater robot with some high technology equipments. It will be used to search for ancient ships which were destroyed into the deep sea during their journey long ago.
The world is changing so quickly that it’s hard for us to catch up with all the new inventions because they seem to come out every month. It’s important for us to learn about new technology and the role that it plays in our lives. So we should be willing to accept modern technology, or we will fall behind the times

1. 1.

                     can tell you where the user is on the earth exactly

   1. A.
      Satellites
   2. B.
      Receivers
   3. C.
      Global Positioning System
   4. D.
      Underwater Robot
2. 2.

   According to the passage, which is NOT true about the ISS?

   1. A.
      It has carried people to other planets
   2. B.
      It will provide a long-lasting lab for us
   3. C.
      Russia and America are working for it
   4. D.
      Humans will get a lot of advantages from it
3. 3.

   Hercules is used to                   

   1. A.
      save lives in the sea
   2. B.
      take pictures in the sea
   3. C.
      repair the broken ships
   4. D.
      look for the ancient ships in the sea
4. 4.

   From the passage, we know that                   

   1. A.
      the use of GPS is affected by the weather conditions
   2. B.
      it’s very important for us to learn about new technology
   3. C.
      it’s easy for us to catch up with all the new inventions
   4. D.
      technology brings us many advantages such as cloning humans
5. 5.

   What is the purpose of the passage?

   1. A.
      To help us study some new technology
   2. B.
      To tell us technology is changing the world
   3. C.
      To help solve the problems that technology causes
   4. D.
      To remind us the advantages of technology are limitless

French doctors and American scientists have reported doing an operation in which the doctor was outside the operating room. This kind of operation is known as robotic operation.

Doctor Marescaux did the operation in an office in New York City last month, while a sixty-eight-year-old woman patient was in a hospital in Strasbourg, France.

A doctor in Strasbourg got the patient ready. He placed medical tools and a small video camera in her stomach area. Doctor Marescaux in New York watched the patient on a video screen. Then he used the computer to send messages to the robot machine. The robot moved the tools that cut the woman’s gallbladder （胆囊） away. The woman got well soon after the operation and left the hospital two days later.

Experts say the main problem with such a robotic operation is based on high-speed telecommunications between the doctor and the robot. Technology must be able to send a doctor’s order to a robot to move the tools quickly.

Experts also say a successful robotic operation will improve an operation. For example, the robot can make much smaller movements than a person can. A robot machine can turn tools in ways that a doctor’s hand cannot.

Doctors say such a robotic operation will make possible safer and better operations in the future. They say it will improve doctor training. It will also mean that doctors could do an operation on people in dangerous places far away. And it could mean that people could have operations done by top doctors without having to travel to the city where doctors work.

1. “Robotic operation” means “________”.

A. a special kind of robot invented by doctors

B. an operation done far away

C. an operation done with the help of a robot

D. something done to mend a robot

2. We use the robot in the operation because _______.

A. it can send messages at a high speed

B. even a top doctor can’t do the operation himself

C. it can make the operation safer and better

D. operations can be done without any doctors

3. If we want to use the robot in the operation, we must solve the problem of ________.

A. top doctors                       B. smaller movements

C. doctor training                                D. high-speed telecommunications

4. If the smaller movement can’t be done by doctors in the operation, we may use _______ to solve it.

A. more tools                                       B. a robot machine

C. a video camera                                D. telecommunications

5. Which of the following is NOT true?

A. Robotic operation is good for doctor training.

B. Robotic operation has been used in the USA.

C. Experts speak highly of robotic operation.

D. The robot is used to watch the patient clearly.

The Internet, mobile phones and iPads are part of our lives now. Technology is greatly affecting all ways of our lives, from the ways we work to the ways we play. And it even causes a number of social problems such as cloning humans.

We have had lots of technology and it has changed our lives a lot. There is no doubt that humans will continue to use more and more technology. Here are some examples of modern technology that will change our ideas and will affect our lives greatly.

Global Positioning System(GPS)(全球定位系统)

It’s a system that uses radio signals from satellites to show exact(精确的) information. It tells you where the user is on the earth in all weather conditions. It’s made up of three parts: satellites, control equipments on land and receivers.

Space Technology

Russian and American scientists have worked together for the International Space Station (ISS) for a long time. They hope the ISS will provide a long-lasting lab. Such a lab will bring humans limitless(无限的) advantages. It’s even hoped that one day space technology will take humans to their new houses in space.

Underwater Robot

Hercules is a kind of underwater robot with some high technology equipments. It will be used to search for ancient ships which were destroyed into the deep sea during their journey long ago.

The world is changing so quickly that it’s hard for us to catch up with all the new inventions because they seem to come out every month. It’s important for us to learn about new technology and the role that it plays in our lives. So we should be willing to accept modern technology, or we will fall behind the times.

42.           can tell you where the user is on the earth exactly.

A. Satellites                                               B. Receivers

C. Global Positioning System                     D. Underwater Robot

43. According to the passage, which is NOT true about the ISS?

A. It has carried people to other planets.

B. It will provide a long-lasting lab for us.

C. Russia and America are working for it.

D. Humans will get a lot of advantages from it.

44. Hercules is used to          .

A. save lives in the sea                              B. take pictures in the sea

C. repair the broken ships                          D. look for the ancient ships in the sea

45. What is the purpose of the passage?

A. To help us study some new technology.

B. To tell us technology is changing the world.

C. To help solve the problems that technology causes.

D. To remind us the advantages of technology are limitless.

The Internet, mobile phones and Ipads are part of our lives now. Technology is greatly affecting all ways of our lives, from the ways we work to the ways we play. And it even causes a number of social problems such as cloning humans.
　　We have had lots of technology and it has changed our lives a lot. There is no doubt that humans will continue to use more and more technology. Here are some examples of modern technology that will change our ideas and will affect our lives greatly.
　　Global positioning system (GPS) (全球定位系统)
　　It’s a system that uses radio signals from satellites to show exact(精确地) information. It tells you where the user is on the earth in all weather conditions. It’s made up of three parts: satellites, control equipments (设备) on land and receivers.
　　Space Technology
　　Russian and American scientists have worked together for the international Space Station (ISS) for a long time. They hope the ISS will provide a long-lasting lab. Such a lab will bring humans limitless(无限的) advantages. It’s even hoped that one day space technology will take humans to their new houses in space.

Underwater Robot

Hercules is a kind of underwater robot with some high technology equipments. It will be used to search for ancient ships which were destroyed into the deep sea during their journey long ago.

The world is changing so quickly that it’s hard for us to catch up with all the new inventions because they seem to come out every month. It’s important for us to learn about new technology and the role that it plays in our lives. So we should be willing to accept modern technology, or we will fall behind the times.

41. ______ can tell you where the user is on the earth exactly.

A. Satellites                       B. Receivers

C. Global Positioning System         D. Underwater Robot

42. According to the passage, which is NOT true about the ISS?

A. It has carried people to other planets.  

   B. It will provide a long-lasting lab for us.

   C. Russian and American are working for it. 

 D. Humans will get a lot of advantages from it.

43. Hercules is used to ______.

A. save lives in the sea                       B. take picture in the sea

C. repair the broken ships                    D. look for the ancient ships in the sea

44. From the passage, we know that ______.

   A. the use of GPS is affected by the weather conditions

   B. it’s very important for us to learn about new technology

   C. it’s easy for us to catch up with all the new inventions

   D. technology brings us many advantages such as cloning humans

45. What is the purpose of the passage?

   A. To help us study some new technology.

   B. To tell us technology is changing the world.

   C. To help solve the problems that technology causes.

   D. To remind us the advantages of technology are limitless.

1.You love peace and do not like to ___________ (争论) with others.

2.Blindness can be treated with modern ___________（医药）and skills.

3.It is ____________ (不可能) for her to finish the work in half an hour.

4.Orange can bring you ____________ (成功) and cheer you up when you are feeling sad.

5.The teacher asked the students to read as many ____________ (杂志) as they could during the reading week.

6. Blue is a calm and __________ (peace) color. It can make you feel relaxed.

7. I think the clever girl can work out the problem__________ (easy).

8.The two American scientists ___________ (work) in the computer company since they came to Nanjing

9.Look at the sign！We are not ________ to park cars here. (允许)

10.The Chinese _________ cares about the people in the drought-hit areas all the time. (政府)

11. What an _________ (愉快) journey we had yesterday!

12.Our Maths teacher spent 2 hours _________ the tough problems to us like this. (解释)

13. So far, five ________ of the boys in Tom’s class have visited the Slender West lake（twelve）

14.I’m __________ sorry to bring you so much trouble. (True)

15. Many students sent Mrs. Wang lots of beautiful flowers on her _________ birthday. (Forty)

For thousands of years, people have used plants to make medicines. They used different parts of the plants —the roots, the leaves, the flowers, and the bark (树皮). Today, doctors have rediscovered more medicinal (药用) values of some plants. Let’s look at some examples.

Foxglove is a common plant. People have used it to make the heart slow down. Recently scientists have developed another drug from it. This new drug helps prevent other heart problems.

In some areas, malaria has been a problem. Scientists have learned that the bark of a South American tree, the cinchona, can be made into a drug to prevent malaria. For a long time, the Chinese have known that a special plant, wormwood, can also fight malaria. Scientists have been working with it to develop new drugs against malaria.

In Germany, some scientists studied garlic (大蒜) for four years. They found that it helps prevent the build-up of plaque (血小板) because too much plaque is bad for health. This very common plant continues to be studied.

As we know, there are about 250,000 kinds of flowering plants in the world. Scientists have only studied little more than one percent of plants for their medicinal value. Maybe medicines for AIDS and cancer will be made from the other 99 percent.

1.What can foxglove be used for?

A．Studying plants.

B．Building up the plaque.

C．Treating AIDS and cancer.

D．Preventing heart problems.

2.What does the underlined word “malaria” in Paragraph 3 refer to (指的是)?

A．A drug.                               B．A plant.

C．An illness.                             D．An animal.

3.How many plants are mentioned in the passage?

A．3.               B．4.                C．5.               D．6

4.Which of the following is the best title for the passage?

A．Past and future

B．Plants and medicine

C．Health and illness

D．Scientists and doctors

In old times，man considered lightning to be one of the great mysteries（神秘事物）of nature．In fact a single flash of lightning 1.6 kilometers long has enough electricity to light one million lamps．
The American scientist，Benjamin Franklin，was the first to suggest that lightning is in fact electricity formed between the earth and clouds high above．It happened in 1752．In the same year，he also built the first lightning rod（避雷针）to protect buildings from being struck by lightnings．
Modern science has discovered that lightning is very strong and powerful．A lightning between a cloud and the earth may be as long as 13 kilometers，and travels at a speed of 30 million meters per second．Scientists have the opinion that there are about 2000 million flashes of lightning per year．In the United States alone，it kills almost one person per day．
The safest place to be in during an electrical（电的）storm is a closed car．Outside，one should go close to low ground for cover and not stop under a tree．Also one should stay out of water and away from metal fences．Inside a house people should keep away from open doorways and windows and not touch wires or metal things．
【小题1】From this passage we know lightning is____．