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
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单项选择题
Craig assured his boss that he would ______ all his energies in doing this new job.
A．call forth
B．call at
C．call on
D．call off
单项选择题
A．go upB．go overC．go onD．go under
A．go up
B．go over
C．go on
D．go under
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