单项选择题

The writer is amazed by the black spider' s ______.

A．delicate construction
B．ability to live in such varied environments
C．unusual intelligence
D．ability to withstand extreme cold
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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
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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