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    精英家教网 > 高中英语 > 题目详情
    All efforts of cloning an animal will be ________ if there is not enough diversity in the group to overcome illness.
    A．in need B．in place C．in vain D．in case
    C
    词义辨析。A需要；B在合适的地方；C徒劳；D以防万一；结合句意可知C正确。句意：如果没有足够的多样性来克服疾病，所有克隆动物的努力都是徒劳的。
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