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
Where can I find Jim He is ______ his work. He won't leave the lab until 6:00 p.m.
A. on
B. over
C. at
D. under
单项选择题
Hellen Keller's ______ over deafness, blindness, and muteness was a miracle.
A. improvement
B. success
C. advance
D. triumph
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