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    Now satellites(卫星)are helping to forecast(预报)the weather. They are in space and they can reach any part of the world.The satellites take pictures of the atmosphere(大气), because this is where the weather forms(形成)。They send these pictures to the weather station. So meteorologists(气象专家)can see the weather of any part of the world. From the pictures, the scientists can often say how the weather will change.
    Today, nearly five hundred weather stations in sixty countries receive satellite pictures. When they receive new pictures,the meteor- ologists compare(比较)them with earlier ones. Peerhaps they may find that the clouds have changed during the last few hours .This may mean the weather on the ground may soon change,too. In their next weather forecast, the meteorologists can say this.
    So the weather satellites are a great help to the meteorologists. Before satellites were invented, the scientists could forecast the weather for about 24 or 48 hours. Now they can make good forecasts for 3 or 5 days. Soon,perhaps , they may be ablet to forecast the weather for a week or more ahead(提前)
    小题1:Satellites travel__________.
    A in space           B in the atmosphere
    C above the ground    D above space
    小题2:Why do we use the weather satellites to take pictures of the atmosphere? Because___________.
    A the weather satellites can do it easily
    B clouds form there
    C the weather forms there
    D the pictures can forecast the weather
    小题3: Meteorologists forecast the weather________.
    A when they have received satellite pictures
    B after they have compared new satellite pictures with earlier ones
    C before they receive satellite pictures
    D while they study satellite pictures
    小题4:Maybe we’ll soon be able to forecast the weather for _______.
    A one day   B two days  C five days   D seven days or even longer
    小题5:The main idea of this passage is that satellite are now used    in______.
    A taking pictures of the atmosphere
    B receiving pictures of the atmosphere
    C doing other work in many ways
    D weather forecasting

    小题1:A
    小题2:C
    小题3:B
    小题4:D
    小题5:D

    小题1:本文第一，二两句为Now satellites(卫星)are helping to forecast(预报)the weather. They are in space and they can reach any part of the world.所表示的含义为卫星有助于预报天气，在太空中，故本题选A。
    小题2:本文第三句为The satellites take pictures of the atmosphere(大气), because this is where the weather forms所表示的含义为天气卫星拍摄大气照片，因为在这个地方是大气构成的地方，故本题选C。
    小题3:本文第二段第二行为When they receive new pictures,the meteor- ologists compare(比较)them with earlier ones. Peerhaps they may find that the clouds have changed during the last few hours .This may mean the weather on the ground may soon change,too所表示的含义为气象专家通过把卫星拍摄的照片和之前的照片作比较，最终得出预报的天气，故本题选B。
    小题4:本文最后一句为perhaps , they may be able to forecast the weather for a week or more ahead(提前)，所表示的含义为我们很快将能够对7天甚至更长时间的天气作出预报，故本题选D。
    小题5:本文主要谈论了天气卫星的有关情况，以及天气卫星如何被使用在天气预报中，故本题选D。
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