单项选择题

It"s impolite to cut in when two persons are holding a conversation.

A．leave
B．talk loudly
C．standup
D．interrupt
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During his lifetime he was able to accumulatequite a fortune.
A．control
B．spend
C．collect
D．exchange
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The chemical is deadlyto rats but safe to cattle.
A．fatal
B．hateful
C．good
D．useful
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