单项选择题

This material______well.

A．wears
B．is worn
C．worn
D．is wearing
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单项选择题
It is necessary that an efficient worker______his work on time.
A．accomplishes
B．can accomplish
C．accomplish
D．has accomplished
单项选择题
A thorough study of biology requires______with the properties of trees and plants, and the habit of birds and beasts.
A．acquisition
B．discrimination
C．curiosity
D．familiarity
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