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    【题目】 cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.

    A. As B. If

    C. Unless D. While

    【答案】D

    【解析】考查连词。A. As由于；B. If如果；C. Unless 除非； D. While尽管。句意： 虽然克隆人类胚胎是违法的，但一些科学家已经在努力推进研究为了制造克隆的人类婴儿。选A。

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