单项选择题

Floods have undermined the foundation of the ancient bridge.

A．weakened
B．reached
C．spoiled
D．covered
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单项选择题
Personality in Americans is further complicated by successive waves of immigration from various countries.
A．uninterrupted
B．successful
C．forceful
D．overwhelming
单项选择题
When a man knows that he will be put into prison if he uses a potentially deadly object to rob or do harm to another person, he will think twice about it.
A．passive
B．lifelong
C．unhappy
D．fatal
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