2. 外语
  3. Now satellites are helping to forecast (预报) the weather. They are in space, and they can reach any part of the world. The satell

Now satellites are helping to forecast (预报) the weather. They are in space, and they can reach any part of the world. The satell

admin2009-06-21  66
问题 Now satellites 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 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(比较) 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).
选项 A、in space
B、in the atmosphere
C、above the ground
答案A
解析 题干的意思是问卫星在哪里飞行。A的意思是在太空中，B的意思是在大气中，C的意思是在地表上。文中的相关细节为"They are in space，and they can reach any part of the world．”，即它们(卫星)在太空中，能到达世界的任何一个地方。故正确答案为A。
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