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    The world is filled with many interesting sounds. Some are very pleasant to hear; others are unpleasant to our ears. In a day, you probably hear hundreds of different sounds.
    All sounds are different. Some may be soft; others may be loud. Some sounds are high; others are low.
    Some sounds are useful. Without sound we cannot talk or listen to one another. The ringing alarm clock (闹钟)makes people wake up. The hooting of a horn (喇叭声) on the road warns careless people of danger.
    We make sounds by making things move to and fro(来回地). This to-and-fro movement is called vibration (振动). It means moving up and down or forwards(向前地) and backwards(向后的) very fast. This makes sound waves(波).
    We can make sounds in many ways, for example, by shouting, clapping our hands and striking the table. We can make sounds only by making things vibrate. We can talk because we can make our vocal cords (声带) vibrate. Our vocal cords are in a sound box or voice box. Two vocal cords vibrate when our lungs(肺) force the air through them.
    小题1:We can make sounds ______.
    A．by making things still
    B．by making things vibrate
    C．by making things jump up and down
    D．by changing the positions of things
    小题2: Some sounds are useful because ______.
    A．they can wake people up
    B．they can warn people to be careful when they are crossing the road
    C．they make it possible for people to talk or listen to each other
    D．all of the above
    小题3:When the air is through our vocal cords, it can make them ______.
    A．vibrateB．breathe the air
    C．talk to each otherD．move forward and backward
    小题4:Sounds are different because ______.
    A．different sounds have different vibrations
    B．different sounds have different sound waves
    C．different sounds have different vocal cords
    D．both A and B

    小题1:B
    小题1:D
    小题1:A
    小题1:D
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    小题3:What do Channel V and VIVA have in common?
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    科目：高中英语 来源：不详 题型：阅读理解

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    小题1:
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    科目：高中英语 来源：不详 题型：阅读理解

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    小题2:.
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    小题3:.
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    科目：高中英语 来源：不详 题型：阅读理解

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    B．Race has nothing to do with the risk of having a lung cancer.
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    科目：高中英语 来源：不详 题型：阅读理解

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    科目：高中英语 来源：不详 题型：阅读理解

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    C．only mothers were given a day off on Mothering Sunday
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    A．all the people should celebrate Mother’s Day
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    科目：高中英语 来源：不详 题型：阅读理解

    A green house is a building made of glass which is used for keeping warm when the outside temperature is low. In a similar way there are several gases in the atmosphere (mixture of gases that surround the earth) which trap the heat produced by the sun and prevent it from escaping. These gases are known as “greenhouse gases”. and the way in which they trap heat in the atmosphere is called the “greenhouse effect”. This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere, and without them the earth would be 30 degrees colder and human life would not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us.
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    小题1: According to the passage, we can know “greenhouse effect” means_______.  
    A．the way in which gases are used for keeping plants warm
    B．a natural course that is to a certain degree useful to us
    C．the way “greenhouse gases” trap heat on the earth
    D．the whole course in which greenhouse gases prevent heat
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    A．all plants would not grow on our planetB．soil would reduce the temperature by 30 degrees
    C．man would breathe the cleaner airD．people couldn’t live in the earth
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    A．Burning too much coal and oil produces lots of greenhouse gases.
    B．It has become warm on the earth now than in the past.
    C．Gases put into the atmosphere now will affect the earth years later.
    D．The temperature in a greenhouse is as high as that in the atmosphere.
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    A．great harm will be done to mankindB．the sea level would go up by 10 centimeters
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    A．the concept (概念) and the harm of the greenhouseB．the relation between greenhouse gases and man
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    科目：高中英语 来源：不详 题型：阅读理解

    When you are curious about something, and want to know more about it, you can use the way of asking questions. Asking questions is the first step to make discoveries and find interesting answers. The steps below can guide you during the research.

    Step 1 On a note card or piece of paper, write down the subject that you are interested in. Just get the main idea down. For example, you might write:

    Discover more about dinosaurs.

    Step 2 Next, stop and think for a moment about what you already know about your subject. List what you already know like the sentences below:

    1. Dinosaurs lived long before human beings appeared.
    2. Dinosaurs lived on the earth for more than 150 million years.
    3. Some dinosaurs fed on plants, some on meat.

    Step 3 What can you do with what you want to learn? By asking questions. On your paper, start writing down questions about the dinosaurs as you think of them:

    1. What’s the best weather for dinosaurs to live in?
    2. How many kinds of dinosaurs are there?
    3. Have dinosaurs really disappeared?

    Step 4 Armed with your list of questions, you can now go to the nearest library or computer to begin your research. As you learn more about your subject, you’ll probably discover some new questions.

    For example, you might discover that dinosaurs disappeared about 65 million years ago. Why? What happened? Asking new questions can help you research your subject more widely.
    The next time you find something interesting to research, take time to organize your thinking by asking good questions. And remember—learning more always bring more questions.
    小题1:When you do some research, you should take the following steps:                .
    ①list what you want to know      ②choose a research subject
    ③list what you already know      ④discover new problems
    A．①④③②B．②③①④C．③②④①D．④③①②
    小题2:What does the underlined sentence “Armed with your list of questions” mean?
    A．Putting your list of questions under your arm.
    B．Discussing your questions with your classmates.
    C．Writing down your list of questions.
    D．Taking your list of questions with you.
    小题3:According to the passage, which of the following is TRUE?
    A．You can find all the answers online.
    B．Learn more, and you’ll have no questions.
    C．During the research, you may keep finding new questions.
    D．Asking questions is the only way for research.
    小题4:. The best title for this passage is              .
    A．Discovering DinosaursB．Asking Good Questions
    C．Finding SubjectsD．Having Interesting Answers

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