练习册

  • 练习册
  • 试题
    精英家教网 > 高中英语 > 题目详情
    .
    Damage to Ozone layer Gets Worse
    In the middle of winter, when snow is falling in many parts of the United States, scientists have sounded a warning to people who plan to spend many hours in the sun this summer. The warning is: The sun’s summertime rays are more dangerous than once thought.
    A team of scientists from 80 nations recently reported to the United Nations that a layer of ozone (臭氧层) in the atmosphere, which protects humans from harmful levels of ultraviolet radiation（紫外线辐射）, will be thinner over the United States this summer. The thinner layer allows more ultraviolet rays from the sun to reach Earth. The extra amount of ultraviolet radiation could cause an increase in the number of cases of skin cancer.
    Scientists first became concerned about the ozone layer in the mid-1980s when a hole was discovered in the layer above Antarctica during the winter. The hole was caused by chemicals used in refrigerators and air conditioners. When these chemicals are sent out into the atmosphere, they produce gases that destroy the ozone.
    Concern about the protective ozone layer rose more recently when data(数据) from satellites and ground stations showed that ozone levels were dropping over areas other than Antarctica. Low ozone levels were recorded in the spring and summer over the United States and over other populated areas in the world.
    Although many countries have already begun stopping the use of ozone destroying chemicals, the new findings are expected to advance the timetable for a total ban(禁止) of the chemicals.
    59.   The scientists have observed the ozone layer_____.
    A.  since 1980             B.  since last winter      
    C.  for about 20 years       D.  for about one year
    60. The ozone layer in the atmosphere can _____.
    A.  do a lot of good to human beings in many ways.
    B.  protect humans from diseases caused by bad weather.
    C.  do a lot of harm to human beings in the summer-time.
    D.  protect humans from harmful levels of ultraviolet radiation.
    61. Scientists first found that there was a hole in the ozone layer_____.
    A.  above Arctic during the winter in the mid-1980s
    B.  above Antarctica during the winter in the mid-1980s
    C.  over somewhere in the north of the equator in 1980
    D.  over the U.S.A in the summertime in the mid-1980s
    62.   The damage to the ozone layer was caused by_____.
    A.  the changeable weather
    B.  ozone-destroying chemicals
    C.  chemicals from refrigerators
    D.  chemicals from air conditioners

    59---62   CDBB 
    略
    练习册系列答案
    年级 高中课程 年级 初中课程
    高一 高一免费课程推荐！ 初一 初一免费课程推荐！
    高二 高二免费课程推荐！ 初二 初二免费课程推荐！
    高三 高三免费课程推荐！ 初三 初三免费课程推荐！
    相关习题

    科目：高中英语 来源：不详 题型：阅读理解


    Getting a new PC is one thing, Keeping it running smoothly is quite another. While a personal computer should continue to perform well for years, users know that system unsteadiness does exist Yet you can reduce it to the smallest amount by following the tips below .
    First, put in as little software as possible. You’11 have fewer software –related problems and a system that is easier to manage.
    Second, you should ensure that you have as much memory (RAM) in your PC as you need If you run  Windows 98,your computer should have as least 128 megabytes (MB)of RAM and more You can also get by with 128 MB of RAM if you use Windows NT or Windows2000,but these operating systems will run much more smoothly if you have 256 MB of RAM or more.
    Third, make sure you buy good hardware. Noname products may be cheaper and sometimes just as good as named-brand products, but name-brand products usually became well-known because of famous companies because Windows will more often support the hardware that you buy ,If you are starting out with to have been tested thoroughly with your operating system, and you will generally experience fewer problems.
    Fourth, do prepare for disaster .No matter how well your system runs when you get it ,the day will come when it will need to be replaced .Hopefully, you will replace it because technology has become outdated, but you may need to replace it also because the hard drive crashes or you begin experiencing problems that no one can figure out .That’s why it ‘s important to you’re your important to copy your important information regularly. Whether you use a tape backup device or a CD-RW drive, it’s important to make a regular backup plan and stick to it .
    小题1:If you want to use Windows2000,but your computer only has 64MB.What will you have to do?
    A. Change its RAM for at least 256MB,   B. Put in good software in your computer.
    C. Enlarge its memory to at least 128 MB  D. Buy another new computer to match it .
    小题2: How many pieces of advice on buying good hard-ware does the writer give us ?
    A．ThreeB．TwoC．OneD．four
    小题3:It can be inferred from the passage that……
    A．your computer will save the important information when its hard drive crashes
    B．Your computer might lose all the information it stores when it crashes .
    C．You must not put in much software.
    D．You’d better use 128 MB of Ram if you run Windows NT.
    小题4:the best title of this passage would be “……”
    A．the Tips You must Follow
    B．How to Start out with a Computer
    C．How to Use your PC Better
    D．How to Keep Your PC Stable
    小题5: what does the underlined word “it ”(paragraph 1)refer to ?
    A．System unsteadinessB．personal computer
    C．To perform wellD．Getting a new PC

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解


    第二部分：阅读理解（共20 小题。第一节共15 小题，每题2分；第二节共5 题，每题2分；共40 分）
    阅读下列短文，从每题所给的四个选项  A．B．C．D中选出最佳选项。
    A
    Unnoticed and unappreciated for five decades，a large female turtle （龟）with a stained（彩色的），leathery（粗而硬的） shell is now a precious commodity（物品）in Changsha’s old zoo．She is fed on a special diet of raw meat．Her small pool has been covered with glass which can defend it from bullets．A special camera monitors her movements．A guard is posted at night．
    The purpose is simple：the turtle must not die．
    Earlier this year，scientists concluded that she was the planet’s last known female Yangtze giant soft shell turtle．She is about 80 years old and weighs almost 90 pounds．
    As it happens，the planet also has only one known male．He lives at a zoo the city of Suzhou．He is 100 years old and weighs about 200 pounds．They are the last hope of saving a species believed to be the largest freshwater turtles in the world．
    “It’s a very dangerous situation,” said Peter Pritchard, a famous turtle expert in the United States，who has helped try to save the species．、
    For many Chinese people，the turtle is the symbol of health and long life，but the last two Yangtze giant soft-shell creatures show the threatened state of wildlife and biodiversity（生物多样性）in China．Pollution, hunting and over development are destroying natural habitats，and also endangering the plant and the animal population．
    China contains some of the world’s richest treasures of biodiversity, yet the latest major survey of plants and animals shows a discouraging picture．Nearly 40 percent of all mammal species in China are now endangered, Scientists say．For plants，the situation is worse；70 percent of all nonflowering plant species and 86 percent of flowering species are considered threatened．
    46．Why is the turtle in Changsha specially cared?
    A．She has been unnoticed and unappreiated five decades．
    B．She can be sold at a high price．
    C．She is the planet’s last known female Yangtze giant soft-shell turtle．
    D．She is old and heavy．
    47．Which of the following statements is TRUE according to the text?
    A．The turtle in Changsha is precious because it is the symbol of health and long life．
    B．Peter Pritchard believes the female turtle is the largest freshwater turtle in the world．
    C．The female turtle is in a dangerous situation where she may be killed．
    D．The female turtle in Changsha and the male turtle in Suzhou are the last hope of saving the largest freshwater turtle species in the world．
    48．According to the text ________in China．
    A．there are the richest species of living things
    B．wild plants and animals are becoming fewer
    C．turtles are specially protected
    D．the situation of plants is better than that of mammal species
    49．The last paragraph proves the threatened state of wildlife and biodiversity in China by__________ ．
    A．facts and numbers                      B．Peter Pritchard’S words
    C．teaching theory                        D．telling a story

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解

    More teachers are starting off the school year with letters to parents and students to introduce themselves and set a tone (基调) for the year．The letters are a good way to start positive communication with parents, several teachers told Education World．
    “I think it’s professional (专业的)，”said Dorothy Peselli, an English teacher at Sparta High School in Sparta, New Jersay, Peselli, who gives out the letters the first day of school, told Education World．“It gives parents an image of you as a professional．If you start communication off in a positive manner, you will have the parents on your side when you need them．”
    In her letter to parents, Peselli encourages them to call or e-mail her with specific concerns about their children．“I want to work as a team to make sure that your child becomes an independent lifelong learner,” Peselli wrote to parents last September．She also telephones the parents of all her students at the beginning of the year．
    Peselli includes with the letter a classroom handbook (手册)listing plans and rules ．And she requires that both parents and students read and sign statements (included in the letter!) that they read the handbook．The student letter also lists needed supplies and gives encouragement．“Please come to class ready to work and learn．This will be an exciting year for all of us,” it says
    Last year, Peselli taught at a different high school and parents there were “shocked”, but appreciative, that she had so much contact with them,“I received roses and a thank-you note from one boy and his mother”．Peselli said．She wished her own children’s teachers would take the time to write notes as well．“I never got a letter home from any of my daughter’s high school teachers．” she said, “It would be nice to know the background of some of the people who are teaching my daughter．”
    小题1:We may learn from the text that            
    A．most teachers are writing letters to parents and students
    B．the handbook is used to list supplies and give encouragement
    C．Peselli believe it important for teachers to exchange information with parents
    D．Peselli mainly introduces her background and teaching experiences in the letters
    小题2:The underlined word “it” in the fourth paragraph refers to         
    A．the handbookB．the requirement
    C．the schoolD．the letter
    小题3:We can infer from the last paragraph that          
    A．parents were satisfied with Peselli’s way of working
    B．Peselli means to surprise parents by writing students
    C．Peselli seemed to be popular among boy students
    D．all Peselli’s children are studying in high schools
    小题4:The purpose of the text is to          ．
    A．introduce an English teaching method
    B．give advice on how to teach students
    C．encourage teachers to keep in touch with parents
    D．show us how Dorothy Peselli makes teaching plans

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解


    Solar energy for your home is coming. It can help you as a single home owner. It can help the whole country as well. Whether or not solar energy can save your money depends on many things. Where you live is one factor. The type of home you have is another. Things like insulation(绝缘) present energy costs and the type of system you buy are added factors.
    Using solar energy can help save our precious fuel. As you know, our supplies of oil and gas are very limited. There is just not enough on hand to meet all our future energy needs. And when Mother Nature says that’s all, the only way we can delay hearing those words is by starting to save energy now and by using other sources, like the sun.
    We won’t have to worry about the sun’s running out of energy for another several billion years or so. Besides begin an endless source of energy, the use of the sun has other advantages as well. The sun doesn’t offer as many problems as other energy sources. For example, fossil fuel plants add to already high pollution levels. With sola energy, we will still need sources of energy, but we won’t need as much. That means we can cut down on our pollution problems.
    With all these good points, why don’t we use more solar power? There are many reasons for this. The biggest reason is money. Until now, it was just not practical for a home owner to put in a solar unit. There were cheaper sources of energy. All this is changing now. Solar costs are starting to equal the costs of oil and electricity. Experts say that gas, oil and electricity prices will continue to rise. The demand for electricity is increasing rapidly. But new power plants will use more gas, oil or coal. Already in some places the supply of electricity is being rationed. Solar energy is now in its infancy. It could soon grow to become a major part of our nation’s energy supply.
    57. Which statement best expresses the main idea?
    A. Something about Solar Energy and Pollution.        B. Solar Energy.
    C. Energy and Pollution                                           D. Energy and Money
    58. Solar energy can help us save ____.
    A. the earth and nature resources                                  B. mother nature
    C. the sun                                                                     D. our precious fuel
    59. Which of the following statements is correct?
    A. Energy from coal would not pollute our living environment.
    B. Energy from natural gas would not pollute our living environment.
    C. Energy from the sun would not pollute our living environment.
    D. Energy from oil would not pollute our living environment.
    60. Solar energy is in its infancy, ____.
    A. but it will be considered as an important part of our nation’s energy supply
    B. yet we will build more power plants
    C. and the supply of electricity will be rationed
    D. but we don’t need practice energy rationing now

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解


    Every baby born a decade from now will have its genetic code (基因编码) mapped at birth, the head of the worlds’ leading genome sequencing (基因图谱) company has predicted.
    A complete DNA read – out for every newborn will be technically possible and affordable in less than five years, promising a revolution in healthcare, says Jay Flatley, the chief executive of Illumina. Only social and legal problems are likely to delay the age of “genome sequences,” or genetic profiles. By 2019 it will have become routine to map infants’ genes when they are born, Dr Flatly told The Times.
    This will open a new approach to medicine, by which conditions such as high blood pressure and heart disease can be predicted and prevented and drugs used more safely and effectively.
    A baby’s genome can be discovered at birth by a blood test. By examining a person’s genome, it is possible to identify raised risks of developing diseases such as cancers. Those at high risk can then be screened more regularly, or given drugs or dietary advice to lower their chances of becoming ill.
    Personal genomes could also be used to ensure that patients get the medicine that is most likely to work for them and least likely to have side – effects.
    The development, however, will raise legal concerns about privacy and access to individuals’ genetic records.
    “Bad things can be done with the genome. It could predict something about someone – and you could possibly hand the information to their employer or their insurance company.” said Dr Flatley.
    “People have to recognize that this horse is out of the barn, and that your genome probably can’t be protected, because everywhere you go you leave your genome behind. Complete genetic privacy, however, is unlikely to be possible”, he added.
    As the benefits become clearer, however, he believes that most people will want their genomes read and interpreted. The risk is nothing compared with the gain.
    64．In the first two paragraphs, the author mainly wants to tell us about__________.
    A．the significant progress in medicine      
    B．the promise of a leading company
    C．the information of babies’ genes    
    D．the research of medical scientists
    65．Which of the following is a problem caused by this approach?
    A．The delaying in discovering DNA.
    B．The risk of developing diseases at birth.
    C．The side – effects of medicine on patients.
    D．The letting out of personal genetic information.
    66．What does the underlined sentence “… this horse is out of the barn” mean?
    A．Genetic mapping technique has been widely used.
    B．Genetic mapping technique is too horrible to control.
    C．People are eager to improve genetic mapping technique.
    D．people can’t stop genetic mapping technique advancing.
    67．What’s Dr Flatley’s attitude towards the technology?
    A．Tolerant.   B．Conservative.   C．Positive.   D．Doubtful.

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解

    The unquestioned role of a student is to learn as much as possible through whatever means it takes to acquire knowledge. Teachers and professors are human beings and are therefore not perfect. No one knows the correct answer to every question even when you limit the questions to a certain field of study. Having certain skepticism (质疑) about what they are being taught can help students to make the teachers even better by correcting mistakes and misinformation.
    Students certainly have a huge role in their own abilities to learn. Teachers should act more as guides along the way rather than try to force each student to learn. The best teachers in the world cannot teach an unmotivated student. If the teacher, for whatever reason, cannot motivate the student, then the student must somehow find a way to motivate himself or herself.
    One method of doing this is by becoming an active rather than a passive student. The more the student involves himself or herself in the act of studying, the better he or she can learn. One of the best ways to become more active is simply to ask the teacher or professor questions. Students who passively sit in a classroom and take everything that the teacher says for granted are not fully using their mental capacities(能力) to learn.
    Better education comes from teachers who are able to get their students to think about a subject rather than merely absorb a certain amount of information. Having a healthy skepticism can improve a student’s ability to both think and absorb knowledge in a learning situation.
    Teachers are human beings and no one is one hundred percent right all of the time, even in a classroom situation. Perhaps a teacher would simply unconsciously say the wrong word or pass on some misinformation that the teacher truly believed was correct. A student’s question could prevent an entire classroom from becoming confused or misinformed.
    There is of course a fine balance between a student having a healthy skepticism, and just
    being a downright(令人不快的) skeptic. But with the proper attitude toward learning and a little skepticism, both the students and teachers can improve upon the learning process and maximize learning efficiency.
    64. Which of the following is the author’s main argument?
    A. Passive learning results from passive teaching in class.
    B. A student’s ability plays a huge role in the learning process.
    C. A healthy skepticism fully depends on students’ motivation and ability.
    D. A healthy skepticism and proper attitude contribute to effective learning.
    65. Being passive learners, the students ________.
    A. use little of their mental ability while studying
    B. seldom involve themselves completely in learning
    C. can hardly tell the right from the wrong in class
    D. simply ask their teachers questions without thinking
    66. According to the passage, a good teacher should ________.
    A. help the unmotivated students patiently
    B. instruct students in the learning process
    C. make no mistakes in the teaching process
    D. answer all the questions raised by students

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解


    Parents should stop blaming themselves because there’s not a lot they can do about it. I mean the teenager problem. Whatever you do or however you choose to deal with it, at certain times a wonderful, reasonable and helpful child will turn into a terrible animal.
    I’ve seen friends deal with it in all kinds of different ways. One strict mother insisted that her son, right from a child, should stand up whenever anyone entered the room, open doors and shake hands like a gentleman. I saw him last week when I called round. Sprawling himself on the sofa in full length, he made no attempt to turn off the loud TV he was watching as I walked in, and his greeting was no more than a quick glance at me. His mother was ashamed. “I don’t know what to do with him these days,” she said. “He’s forgotten all the manners we taught him.”
    He hasn’t forgotten them. He’s just decided that he’s not going to use them. She confessed(坦白) that she would like to come up behind him and throw him down from the sofa onto the floor.
    Another good friend of mine let her two daughters climb all over the furniture, reach across the table, stare at me and say, “I don’t like your dress; it’s ugly.” One of the daughters has recently been driven out of school. The other has left home.
    “Where did we go wrong?” her parents are now very sad. Probably nowhere much. At least, no more than the rest of that unfortunate race, parents.
    71. This text is most probably written by ______.
    A. A specialist in teenager studies.      B. a headmaster of a middle school
    C. a parent with teenage children       D. a doctor for mental health problems
    72. The underlined word “it” in the second paragraph refers to ______.
    A. the change from good to bad that’s seen in a child
    B. the way that parents often blame themselves
    C. the opinion that a child has of his parents
    D. the advice that parents want their children to follow
    73. The boy on the sofa would most probably be described as ______.
    A. lazy       B. quiet       C. unusual       D. rude
    74. From the second example we can infer that the parents of the two daughters ______.
    A. pay no attention to them          B. are too busy to look after them
    C. have come to hate them           D. feel helpless to do much about them
    75. What is the author’s opinion about the sudden change in teenage children?
    A. Parents have no choice but to try to accept it.
    B. Parents should pay still more attention to the change.
    C. Parents should work more closely with school teachers.
    D. Parents are a fault for the change in their children.

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解


    The GUARANTEE ON THIS WATER HEATER IS IN EFFECT ONLY WHEN THE HEATER IS INSTALLED AND OPERATED IN ACCORDANCE WITH THESE INSTRUCTIONS. READ THESE INSTRUCTIONS THOROUGHLY BEFORE STARTING.
    LOCATION:
    　　Select a location accessible to water lines and power supply. Do not locate the heater where water lines could be subjected to(受…影响) freezing temperatures. It is recommended that the heater be located near the center of greatest hot water usage to prevent heat loss through the pipes.
    ELECTRICAL CONNECTIONS:
    　　Before any electrical connections are made, be sure that the heater is full of water and that the valve(阀门) in the cold water supply line is open.
    OPERATION
    When the switch is closed, the operation of this electric water heater is automatic. The thermostats are preset to the "HOT" setting to provide a water temperature of approximately 120oF to reduce the risk of being burnt.
    MAITENACE
    Shut off the electric power whenever the water supply is turned off.
    Shut off the electric power, water supply and drain the heater completely to prevent freezing whenever the building is left unoccupied during the cold weather months.
    SERVICE
    The trip–free devices on this heater will cut off all power if temperature of water is above 190F. If there is no hot water after a reasonable period of time, check the main fuse(保险丝) box. In the event that the fuses have not blown, call a serviceman.
    72.The location of the water heater shall ___________.
    A. be close to water lines and power supply
    B. be subjected to low temperature
    C. be in the centre of the house
    D. have a longer distance to hot water usage.
    73.Before any connection of power , make sure that one thing you have to do is _____.
    A. to have the heater in the water     B. to open the cold water inlet valve.
    C. to shut off the thermostats         D. to replace wiring diagram
    74.When you are not using the heater in winter months, it is better for you to________.
    A. have the tank full of clear water    B. drain the heater
    C. to leave it untouched             D. prevent it from losing heat
    75. What will happen to the heater when the temperature of water is above 190F?
    A. it will cause damage         B. It will break off automatically.
    C. It will produce cold water.    D. It will blow the fuse.

    查看答案和解析>>

    同步练习册答案