单项选择题

In spring, traffic was often______ along the roads to holiday places.

A．added up
B．built up
C．held up
D．pulled up
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单项选择题
Too much ______ to X-rays can cause skin burns, cancer or other damage to the body.
A．disclosure
B．exhibition
C．contact
D．exposure
单项选择题
We find that some birds ______twice a year between hot and cold countries.
A．transfer
B．migrate
C．commute
D．mobilize
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