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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.
【C1】
选项 A、Then
B、Yet
C、So
D、And
答案B
解析 本句相对于上两句而言，意思明显发生转折，因此需要填入一个表示转折关系的连接词，B项Yet(然而)是正确答案。A项Then表示顺序，C项So表示因果关系，D项And表示同一意思的延续，用在此处都不合适。
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