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Now satellites are  1  to forecast（預(yù)報）the weather. They are in space, and they can    2  any part of the world．The satellites take pictures of the atmosphere（大氣）， 3 this is where the weather forms（形成）. They send these  4  to the weather stations. So meteorologists（氣象學(xué)家）can see the weather of any part of the world．From the pictures, the scientists can often say 5    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  6 . Perhaps they may find that the clouds have changed during the last few hours. This may mean that the    7    on the ground may soon change, too. In their next weather forecast, the meteorologists can say this.

So the weather satellites are a great    8    to the meteorologists.    9 __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     10    forecast the weather for a week or more ahead（提前）.

1．A．help              B．to help         C．helped               D．helping

2．A．reach             B．a(chǎn)rrive          C．get                  D．go

3．A．so               B．because        C．even                D．a(chǎn)nd

4．A．satellites          B．pictures        C．weather              D．space

5．A．that              B．for            C．where               D．how

6．A．it                B．one            C．ones                D．them

7．A．clouds           B．weather        C．pictures              D．trees

8．A．report           B．luck            C．helpful               D．help

9．A．Before           B．After           C．Since                D．If

10．A．can           B．be             C．be able to            D．could