单项选择题

The assumption of free entry implies that if firms in an industry are earning excessively high profits, new firms that seek to do the same thing are likely to________.

A．bring up
B．build up
C．spring up
D．strike up
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单项选择题
It is bad manners to ________people when they are speaking.
A．interview
B．intimate
C．interfere
D．interrupt
单项选择题
The Prime Minister refused to ________on the rumor that he had planned to resign.
A．explain
B．comment
C．remark
D．talk
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