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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.
From the selection, we may conclude that ______.
选项 A、spiders have adapted to many unlikely environments
B、on the whole spiders are delicate creatures
C、a species of black spiders can live anywhere
D、spiders are the greatest marvel of natural science
答案A
解析 第二段提到黑蜘蛛居住在海拔很高的珠穆朗玛峰山坡，最后一段提出蜘蛛居住在其他unlikely Places，并举例说明，因此可得出结论蜘蛛能够适应不同的环境。
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