先通读短文,掌握其大意,然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案,并将其标号填入题前括号内。

Now satellites are  16  to forecast(预报)the weather. They are in space, and they can   17  any part of the world. The satellites take pictures of the atmosphere(大气), 18 this is where the weather forms(形成). They send these  19  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 20   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  21 . Perhaps they may find that the clouds have changed during the last few hours. This may mean that the   22   on the ground may soon change, too. In their next weather forecast, the meteorologists can say this.

So the weather satellites are a great   23   to the meteorologists.   24 __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    25   forecast the weather for a week or more ahead(提前).

(  ) 16. A. help    B. to help   C. helped     D. helping

(  ) 17. A. reach   B. arrive    C. get      D. go

(  ) 18. A. so     B. because   C. even     D. and

(  ) 19. A. satellites  B. pictures   C. weather    D. space

(  ) 20. A. that    B. for     C. where     D. how

(  ) 21. A. it     B. one    C. ones     D. them

(  ) 22. A. clouds   B. weather   C. pictures    D. trees

(  ) 23. A. report    B. luck    C. helpful     D. help

(  ) 24. A. Before   B. After    C. Since     D. If

(  ) 25. A. can     B. be     C. be able to   D. could

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