As we know, too much ________ to Xrays can cause skin burns, cancer or other da

题干

As we know, too much ________ to Xrays can cause skin burns, cancer or other damage to the body.

A．contact	B．appeal
C．exposure	D．contribution

上一题下一题 0.64难度单项选择更新时间:2014-07-10 04:22:48

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