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
I ________all that we had done and then went on to deal with the attack by the police.
A．justified
B．excused
C．convicted
D．notified
单项选择题
It is laid down that undergraduate students have no ________to the rare book in the school library.
A．access
B．entrance
C．way
D．path
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