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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.
【C6】
选项 A、imaginary
B、incredible
C、ideal
D、poor
答案B
解析 根据空格前的冠词an，可首先排除D项poor。其他三项中，A项imaginary意为"虚构的，想像的"，B项incredible意为"难以令人置信的"，C项ideal意为"理想的"。上句提到的蜘蛛生活在海拔22 000英尺的山坡上，这是事实，不是虚构，因此A项不正确，这样的地方对于如此小的动物来说确实是难以置信的，因此可推断正确答案为B。
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