单项选择题

Although a herd of African elephants may have up to one thousand members,Asiatic elephants live in bands of five to sixty animals.

A．as many as
B．more than
C．fewer than
D．at least
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Machine tools vary in size from handheld devices used for drilling and grinding to large stationary machines that perform a number of different operations.
A．exist
B．expand
C．compare
D．range
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Jumping spiders have excellent eyesight and can see their prey from a distance twenty times their own length.
A．victim
B．target
C．nest
D．prize
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