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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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

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