2. 外语
  3. Mirages(海市蜃楼)are produced by refraction(折射)of light within a layer of air. This layer of air resists【C1】______up, even in a fair

Mirages(海市蜃楼)are produced by refraction(折射)of light within a layer of air. This layer of air resists【C1】______up, even in a fair

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问题     Mirages(海市蜃楼)are produced by refraction(折射)of light within a layer of air. This layer of air resists【C1】______up, even in a fairly strong wind.
    Probably the most popular mirage picture is one of a lake in a【C2】______desert. There may even be the appearance of【C3】______breaking on the shore. The easiest form of mirage to study, however, is one that has been seen by millions of people-those seeming strips of water on asphalt-surfaced(柏油路面的)roads that disappear suddenly when one【C4】______them.
    The scientist considers the long distance mirage as the most【C5】______of mirage forms, since it is against a basic law of physics. The law states that the apparent size of an【C6】______seems smaller as we move away from it; however, this kind of mirage will carry a【C7】______of a ship, a town, or an island a thousand miles and set it up in the sky as big as life.
    Mirages may have had an【C8】______on history: A World War I story deals with a battle between the Turks and the British.【C9】______the stronger Turkish army was gaining the advantage when one of the soldiers reported that British troops were advancing. After a hurried meeting, the Turkish forces withdrew(撤退). In reality there were no【C10】______British troops—what had been reported was a mirage showing men who were a hundred miles away.
    A similarly B. supposedly C. puzzling D. waves
    E. negotiates F. advancing G. effect H. hostile
    I. breaking J. waterless K. liberty L. picture
    M. object N. approaches O. humble
【C7】
选项
答案L
解析 此处应为名词。首先由空白处前的冠词a可以判断，该名词是以辅音开头的单数名词，词库中的liberty为不可数名词，因此只有picture符合条件。另外联系句中提到的mirage，ship，town，island等词，可以推断它们并不是真实地出现在天空中，只是它们的影像出现在天空中，只有picture可以表达“影像”的意思。
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大学英语四级

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