单选题
Spiders "hold their planetary seat with assurance" because they are ______.
A、
more numerous than any other species
B、
able to adapt to hostile environments
C、
masters of the earth's surface
D、
all of the above
【正确答案】
B
【答案解析】
第二段中作者一直在解释“他们是如何在几千尺高的悬崖上生存，怎样对付寒冷和温差”等等。意在说明它们能够“hold their planetary seat with assurance”是因为“他们能够适应各种艰苦的环境。”
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