cloning may be used for medical treatment, everyone doesn’t support it.A. While B. AsC. Since D. Un

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【题目】________ cloning may be used for medical treatment, everyone doesn’t support it.

A. While B. As

C. Since D. Unless

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【答案】A

【解析】

考查连词词义辨析。句意：虽然克隆可以用于医疗，但并不是每个人都支持。A. While虽然；B. As因为；C. Since自从；D. Unless除非。故选A。