题目内容
5．_______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． | Because | B． | While | C． | When | D． | Unless |
分析 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．
解答 答案B．考查让步状语从句．根据句意，此处用表示"虽然…但是"的连词．while可引导让步状语从句，意为"虽然…但是"．while引导时间状语从句时，意为"当…时"．when当…时候，引导时间状语从句．since引导原因状语从句，意为"因为，由于"，引导时间状语从句，意为"自…时起"．if only为"但愿"．
点评 考查从句连词时要弄清连词本身的含义，做题时一定要根据上下文的逻辑关系选择．
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