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.
【C4】
选项 A、rail
B、route
C、orbit
D、path
答案C
解析 词汇线索题。根据常识，人造卫星肯定是发射至环地球轨道的，故C项orbit正确。rail“铁轨”；route“路程，通道”；path指因特殊用途而修建的路、径或轨道，如：a bicycle path(自行车道)。
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