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    精英家教网 > 高中英语 > 题目详情
    No one has yet succeeded in explaining the ___ of how life began.
    A．causeB．problemC．reasonD．puzzle
    A
    词义辨析。Cause原因；目标； problem 问题，难题；reason 原因，理由，动机； puzzle 难题，迷惑。句意：还没有人在解释生命是如何起源的这个原因上取得成功。 reason着重指解释或说明某事发生的理由或原因；cause着重指产生或造成某事发生的原因。结合语境可知选A，为最佳答案。
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