Question

Now satellites are helping to forecast 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. They send these pictures to the weather stations. So meteorologists（气象学家）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 meteorologists compare them with earlier ones. Perhaps they may find that the clouds have changed during the last few hours. This may mean that 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 three or five days. Soon, perhaps, they may be able to forecast the weather for a week or more ahead（提前）

1. 1.
   Satellites travel______.
   
   1. A.
      in space
   2. B.
      in the atmosphere
   3. C.
      above the ground
   4. D.
      above space
2. 2.
   Why do we use the weather satellites to take pictures of the atmosphere? Because ______.
   
   1. A.
      the weather satellites can do it easily
   2. B.
      clouds form in the atmosphere there
   3. C.
      the weather forms in the atmosphere
   4. D.
      the pictures can forecast the weather
3. 3.
   Meteorologists forecast the weather______.
   
   1. A.
      when they have received satellite pictures
   2. B.
      after comparing the pictures with earlier ones
   3. C.
      before they received satellite pictures
   4. D.
      while they study satellite pictures
4. 4.
   The main idea of this passage is that satellites are now used in______.
   
   1. A.
      taking pictures of the atmosphere
   2. B.
      receiving pictures of the atmosphere
   3. C.
      doing other work in many ways
   4. D.
      weather forecasting to the pictures

Answer 1

ACBD
试题分析：文章主要讲了气象学家是如何利用气象卫星进行天气预报的。
1.根据第一段第二句They are in space可知卫星是在太空中的，所以本题选A。
2.通过文章第三句The satellites take pictures of the atmosphere（大气）, because this is where the weather forms.可知天气形成于大气层，所以本题选C。
3.通过文章第二段第二句When they receive new pictures, the meteorologists compare them with earlier ones.可知气象学家在比较之后才报天气。所以本题选B。
4.通过阅读可知本文主要讲了卫星通过拍照来预测天气预报，所以本题选D。
考点：本题考查科普类文章
点评：本题的考查的题目，源于文章，但又必须通过阅读，对文章加以理解方能得出答案，故本题有一定的难度。所以对于本文，应该充分阅读，尽可能从总体上把握文章的大意，还应该结合一些生活常识。