单项选择题

The selection says that spiders have been discovered ______.

A．five miles above earth
B．more than 2000 feet underground
C．everywhere that man has reached
D．both A and B
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单项选择题
The species of black spiders discovered on Mount Everest is ______.
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
单项选择题
The author thinks that spiders ______.
A．rival man as master of the earth
B．are as firmly established on the earth as man
C．are more vigorous than man
D．are more firmly established on the earth than man
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