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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单项选择题
Almost all economists agree that nations gain by trading with one another.
A．work
B．profit
C．rely
D．prove
单项选择题
We consume a lot more than we are able to produce.
A．waste
B．buy
C．use
D．sell
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