单项选择题

Small animals are said to live faster than big ones because they ______.

A．have more skin for every ounce of body weight
B．replace lost heat faster
C．bum fuel faster
D．maintain a higher body temperature
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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
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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