单项选择题

College students in this city have set up "the Cleaner Air Society" to help urban citizens become aware of the _________ to our environment.

A．conditions
B．situations
C．dangers
D．threats
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单项选择题
During the famine of 1943, millions of peasants _________ to the cities because they could not make a living in the countryside.
A．immigrated
B．emigrated
C．migrated
D．generated
单项选择题
This year, the number of accidents has _________ that of last year.
A．overtaken
B．overweighed
C．overcome
D．overshadowed
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