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
During his lifetime he was able to accumulate quite a fortune.
A．control
B．spend
C．collect
D．exchange
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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