单项选择题

A plastic wheel can be as tough as a metal one.

A．useful
B．tight
C．weak
D．strong
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单项选择题
If wool is put into hot water, it tends to shrink.
A．disappear
B．expand
C．break
D．contract
单项选择题
As a writer, he turned out three novels that year.
A．refused
B．read
C．produced
D．accepted
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