Safety officials have earnestly, questioned whether the increased use of synthetic-中华考试网-中华考试网

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Safety officials have

来源 :中华考试网 2017-10-16

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单选题Safety officials have earnestly, questioned whether the increased use of synthetic materials heightens the risk of fire.

A.cautiously

B.severely

C.accurately

D.seriously

参考答案：D

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