摘要：There are four kinds of satellites．The first kind of satellite studies the 31 of the earth．They are used to 32 maps．They also help countries to see where they may 33 oil or gold．The second kind guides ships and planes．A ship or plane can send 34 to the satellite.and the satellite can find out where it is．The third kind studies 35 ．These satellites 36 clouds and strong winds moving across the earth．They warn countries when very 37 weather is coming．They take photos of the earth from thousands of kilometers above it and 38 the photos to a weather station on the ground．The fourth kind is used for communication．Telephone calls 39 countries can be sent by these satellites．Some can carry hundreds of calls at one time．The calls are sent to the satellite.then the satellite sends them to a station in the country Which is being phoned. These satellites 40 carry television pictures．They can receive and send about eight programs at a time．How amazing!

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