阅读短文，根据其内容，从A、B、C、D四个选项中选择最佳答案。

　　Man has invented four kinds of satellites．The first kind of satellite studies the 　　1　　 of the earth．They are used to make maps．They also help countries to see where they may 　　2　　 oil or gold．

　　The second kind of satellite is used to guide ships and planes．A ship or a plane can 　　3　　 a message to the satellite, and the satellite can find out 　　4　　 the ship or the plane is．

　　The third kind studies the weather．These satellites 　　5　　 clouds and strong winds moving across the earth．They warn countries to make preparations when very 　　6　　 weather is coming．　　7　　 kind is used for communication．Telephone calls 　　8　　 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 　　9　　 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 　　10　　 at a time．

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完形填空

　　In some parts of the world there are large deserts．There are no trees and 　　1　　 water there．Travelers must take food and 　　2　　 with them．

　　The 　　3　　 animal that can walk through the desert is the camel．　　4　　 can go without food and water for a long time．And besides he can carry heavy loads．people call the 　　5　　“the ship of the desert”．

　　The camel is very big．He has one or two humps(驼峰)on his back, short ears and a long 　　6　　．

　　The camel's humps hold fat, and his stomach holds water in twelve deep pockets．　　7　　 pocket has a mouth which closes, and the food does not mix the water．When the camel 　　8　　 some water, he can get it out of the 　　9　　．The camel's food is 　　10　　 and leaves of trees．

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完形填空

　　Man has invented four kinds of satellites．The first kind of satellite studies the 　　1　　 of the earth．They are used to make maps．They also help countries to see where they may 　　2　　 oil or gold．

　　The second kind of satellite is used to guide ships and planes．A ship or a plane can 　　3　　 a message to the satellite, and satellite can find out 　　4　　 the ship or the plane is．

　　The third kind studies the weather．These satellites 　　5　　 clouds and strong winds moving across the earth．They warn countries to make preparations when very 　　6　　 weather is coming．　　7　　 kind is used for communication．Telephone calls 　　8　　 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 　　9　　 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 　　10　　 at a time．

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