Asweknow,toomuchtoXrayscancau

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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

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the teacher us, we can make great progress.

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B．With; lead

C．As; lead

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A．developed; belongs	B．developing; belonging
C．developing; belonged	D．developed; belonged

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It is _______ pleasant surprise to learn that Mary is ______ great success as a writer.

A．a; a

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