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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.
【C4】
选项 A、creatures
B、pests
C、insects
D、plants
答案A
解析 本句是一个含有比较级的句子，要求前后相比较的内容是同一概念的东西。根据常识，蜘蛛不是昆虫类，也不是植物，所以B项pests(害虫)、C项insects(昆虫)和D项plants(植物)用在此处都不正确。正确答案是A项creatufts(动物，生物)。
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