单项选择题

It is laid down in the regulations that all members must carry their membership cards at all times.

A．suggested
B．warned
C．stated
D．confirmed
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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
The chemical is deadly to rats but safe to cattle.
A．fatal
B．hateful
C．good
D．useful
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