单项选择题

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

A. leave
B. talk loudly
C. stand up
D. interrupt
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During his lifetime he was able to accumulate quite a fortune.
A. control
B. spend
C. collect
D. exchange
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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