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
The conference exploredthe possibility of closer trade links.
A．denied
B．investigated
C．stressed
D．created
单项选择题
Almost all economists agree that nations gainby trading with one another.
A．work
B．profit
C．rely
D．prove
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