单项选择题

Too much______ to X-rays can cause skin burns, cancer or other damage to the body.

A．manifestation
B．revelation
C．attachment
D．exposure
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单项选择题
As soon as the birthday party______ ,all the guests hurried home at once.
A．broke in
B．broke up
C．broke out
D．broke down
单项选择题
The government will be better able to______ other problems because it won't be caught up in planning ahead for future population growth.
A．tackle
B．challenge
C．gear
D．eliminate
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