2. 外语
  3. A. always B. accumulating C. density D. function E. gathering F. hostile G. live H. living I. monito

A. always B. accumulating C. density D. function E. gathering F. hostile G. live H. living I. monito

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问题    A. always    B. accumulating    C. density    D. function    E. gathering
   F. hostile    G. live       H. living     I. monitor    J. never
   K. realm    L. rotation      M. selected    N. sphere    O. veil
   Sputnik 1 was the first artificial satellite. It can be described as an aluminum 【C1】______ with a diameter of 58 centimeters and weighing 83.6 kilograms, equipped with instruments to measure the temperature and the 【C2】______ of the atmosphere. Sputnik 1 was launched into orbit around the Earth by the former Soviet Union on 4 October 1957. Since then, hundreds of artificial satellites have been launched, each with a different 【C3】______.
   Some artificial satellites are used for telecommunication, which enable us to make telephone calls to any part of the world, to see 【C4】______ television transmissions and to communicate via the Internet. Other artificial satellites are used for navigation, so that people on Earth can know at any moment the position of an object, within a few meters. Others are weather or meteorological  (气象的)satellites, launched to 【C5】______the state of the atmosphere and to follow the movement of the clouds as they gather. There are also military satellites, for the purpose of 【C6】______information on the armaments and the troops in countries which may be 【C7】______ and also to indicate the launch of a missile.
   Each satellite has its own orbit which is 【C8】______ according to its purpose. Communications satellites, for example, have a geostationary orbit. That is an orbit which turns at the same speed as the 【C9】______ of the Earth. Satellites used for weather forecasting pass over the two poles of the Earth. By so doing, a different part of the Earth surface is viewed on each successive orbit. All artificial satellites get the energy they need by huge solar panels which extend like wings. These are therefore controlled in such a way that they are 【C10】______ turned toward the Sun.
【C9】
选项
答案L
解析 空格前the提示空格处应填入名词。根据关键词an orbit“轨道”和turn at the same speed as“以与……相同的速度旋转”，可推断L项rotation“旋转”正确，填入句子意为“这种轨道与地球自转保持同步”，句意通顺，故选L。
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