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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 the atmosphere’ s uppe

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

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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 the atmosphere’ s upper reaches. Yet it is doubtful whether man, with ’all of his intelligence and vigor, holds his planetary seat with greater assurance than a vast tribe of small, many-legged animals that pass their lives at his feet--the spiders.
    Spiders are among the miracles of science. They dwell at higher altitudes than any other creature their size or lager. On the slopes of Mount Everest, at an altitude of twenty-two thousand feet-- five thousand feet above the vegetation line--lives a species of black spider only a quarter of an inch long. This is an incredible environment for creatures so delicately constructed. To protect themselves from the chill of night, they take shelter in crevices where the twenty-four-hour variation in temperature is only twelve degrees, as against forty-four on the outside.
    Spiders inhabit others unlikely places--rabbit burrows, flowers, anthills, and the desolate, drafty aeries of eagles. They have been found soaring through the air five miles above the earth. One species has been discovered in an African cavern move than two thousand feet underground.
The species of black spiders discovered on Mount Everest is ______.
选项 A、the smallest species of spiders
B、the highest altitude dweller among creatures of that size or larger
C、the only creature that lives at that altitude
D、capable of surviving in any environment
答案B
解析 第二段提到蜘蛛dwell at higher altitudes than any other creature their size or larger，可见蜘蛛在和它大小相似或比它大点的动物当中居住海拔最高。
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