单项选择题

The following paragraph would most probably deal with ______.

A．train and air travel
B．traffic jams in London
C．possible solutions to London' s poor transportation
D．car ownership that continues to grow
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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
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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