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）.

　　66. Satellites travel _____________.

　　A. in space

　　B. in the atmosphere

　　C. above the ground

　　D. above space

　　67. 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

　　68. Meteorologists forecast the weather __________.

　　A. when they have received satellite pictures

　　B. after they have compared new satellite pictures with earlier ones

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