单项选择题

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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单项选择题
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
单项选择题
The boats of the earliest voyagers to the North American continent were exceptionally well built.
A．shoes
B．plows
C．barns
D．ships
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