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  3. Man has become master of the Earth’s surface. He is constantly probing into the earth’s depths and into atmosphere’s upper reach

Man has become master of the Earth’s surface. He is constantly probing into the earth’s depths and into atmosphere’s upper reach

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问题     Man has become master of the Earth’s surface. He is constantly probing into the earth’s depths and into atmosphere’s upper reaches.【C1】______ it is doubtful whether man, with all of his intelligence and vigor, holds his planetary seat with greater【C2】______ than a vast tribe of small, many-legged animals that pass their lives at his feet—the spiders.
    Spiders are among the【C3】______ of science. They dwell at higher altitudes than any other【C4】______ of their size or larger. On the slopes of Mount Everest, at an altitude of twenty-two thousand feet—five thousand feet above the vegetation line—【C5】______ a species of black spider only a quarter of an inch long. This is an【C6】______ environment for creatures so delicately constructed. To protect themselves from the chill of night, they take shelter in crevices where the twenty-four-hour【C7】______ in temperature is only twelve degrees, as against forty-four on the outside.
    Spiders live in other unlikely【C8】______ —rabbit burrows, flowers, anthills, and the desolate, drafty aeries of eagles. They have been found soaring through the air five miles【C9】______ the earth. One【C10】______ has been discovered in an African cavern more than two thousand feet underground.
【C3】
选项 A、puzzles
B、mysteries
C、marvels
D、studies
答案C
解析 从下文提到的蜘蛛生活的地方可以推断，它们是科学上的一大奇迹，所以正确答案应选C。A项puzzles指"谜，难题"，B项mysteries指"神秘的事"，这两个选项均与下文提到的内容不相符合，因此都不是正确答案。D项studies是指"研究"，与原文意思相差更远。
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