单项选择题

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
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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
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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