单项选择题

From the selection, we may conclude that ______.

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

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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

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