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  3. Now satellites are helping to forecast the weather. From space, they can see any part of the earth. These satellites take pictur

Now satellites are helping to forecast the weather. From space, they can see any part of the earth. These satellites take pictur

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问题     Now satellites are helping to forecast the weather. From space, they can see any part of the earth. These satellites take pictures of the atmosphere, because this is where the weather forms. These pictures are sent to weather stations on earth. Meteorologists can see the weather of any part of the world. From the pictures, the scientists can often see 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 report this.
    So 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.
The main idea of this passage is that satellites are now used in ________.
选项 A、taking pictures of the atmosphere
B、receiving pictures of the atmosphere
C、doing many other types of work
D、weather forecasting
答案D
解析 事实细节题。A的意思是拍摄大气图片，B的意思是接收天气图片，c的意思是做各种工作。短文主要讲述卫星是如何用于天气预报的。A与原文意思不符，C说得过于具体，故正确答案为D。
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