完形填空。
Man has invented four kinds of satellites (卫星). The first kind of satellite studies the  31  of the earth. They are used to make maps. They also help countries to see where they may  32  oil or gold.
The second kind of satellite is used to guide ships and planes. A ship or a plane can  33  a message to the satellite, and the satellite can find out  34  the ship or the plane is.
The third kind studies the weather. These satellites 35 clouds and strong winds moving across the earth. They warn countries to make preparations (准备) when very  36 weather is coming.  37  kind is used for communication. Telephone calls  38  countries can be sent by these satellites. Some can carry hundreds of calls at the same time. The call is sent to the satellite, then the  39 sends it to a station in the country and
this country is being phoned. These satellites also carry pictures; they can receive and send about eight
  40  at a time.
(  )1. A. biology
(  )2. A. study
(  )3. A. write
(  )4. A. where
(  )5. A. search
(  )6. A. sunny
(  )7. A. The last
(  )8. A. during
(  )9. A. TV
(  )10.A. plays

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