日本成人片在线_久久免费精品视频_国产午夜精品久久久久久免费视_校花撩起jk露出白色内裤国产精品_av影片免费在线观看_国产小视频在线看_最新av免费在线观看_99久久99久久精品国产片_欧美成人猛片aaaaaaa_蜜桃免费网站一区二区三区

Now satellites are  1  to forecast（預(yù)報(bào)）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