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

A. While B. As

C. Since D. Unless

【答案】A

【解析】

考查連詞詞義辨析。句意：雖然克隆可以用于醫(yī)療，但并不是每個(gè)人都支持。A. While雖然；B. As因?yàn)椋?/span>C. Since自從；D. Unless除非。故選A。

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