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
Some minerals are quite common, others are regionally ______, and still others are rare on the earth.
A．attributed
B．distributed
C．contributed
D．scattered
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
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