2. 外语
  3. Sputnik I was the first artificial satellite. It can be described as an aluminum【C1】______ with a diameter of 58 centimeters and

Sputnik I was the first artificial satellite. It can be described as an aluminum【C1】______ with a diameter of 58 centimeters and

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问题     Sputnik I was the first artificial satellite. It can be described as an aluminum【C1】______ with a diameter of 58 centimeters and weighing 83.6 kilograms,【C2】______ with instruments to measure the temperature and the【C3】______ of the atmosphere. Sputnik I was launched into【C4】______ around the Earth by the former Soviet Union on 4 October 1957. Since then, hundreds of artificial satellites have been launched,【C5】______ with a different function.
    Some artificial satellites are used for telecommunication, which【C6】______ us to make telephone calls to any part of the world, to see【C7】______ television transmissions and to communicate via the Internet. Other artificial satellites are used for navigation,【C8】______ people on Earth can know【C9】______ any moment the position of an object, within a few meters.【C10】______ are weather or meteorological satellites, launched to【C11】______ the state of the atmosphere and to follow the【C12】______ of the clouds as they gather. There are also military satellites, for the purpose of【C13】______ information on the armaments and the troops in countries which may be【C14】______ and also to indicate the launch of a missile.
    Each satellite has its own orbit which is【C15】______ according to its purpose. Communications satellites, for example, have a geostationary orbit. That is an orbit which turns at the same speed as the【C16】______ of the Earth. Satellites used for weather forecasting pass over the two poles of the Earth.【C17】______ so doing, a different part of the Earth surface is viewed on each【C18】______ orbit. All artificial satellites get the energy they need by huge solar panels which【C19】______ like wings. These are【C20】______ controlled in such a way that they are always turned toward the Sun.
【C17】
选项 A、In
B、Upon
C、By
D、With
答案C
解析 逻辑关系题。考查介词的使用。此处的so doing指上文提到的不同目的的人造卫星有不同的运行轨道，需填入表方式方法的介词，因此应选C项By。in和upon没有表示“通过，依靠”的意思，with可以用来表示“用，靠(使用的手段、工具)”，但它后面一般接名词，而不接动词-ing形式。
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