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
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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 line was carrying equal number of eastbound and westbound trains, and they ______ regularly.
A．altered
B．alternated
C．switched
D．exchanged
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