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    5．      is known to all，the earth moves around the sun．（　　）
    A．ItB．WhatC．WhichD．As

    分析 众所周知，地球围绕太阳转．

    解答 答案：D．
    分析句子结构以及主句前面的逗号可知，___ is known to all是非限制性定语从句，故排除A、B；which引导的非限制性定语从句不可以位于句首，故排除C，as is known to all是固定搭配，"众所周知"，所以选D．

    点评 本题考查定语从句．做这类题型时，首先要判断从句是否是定语从句；然后分析从句的句子成分，缺主语、表语、宾语、定语用关系代词，缺状语时用关系副词；最后看先行词，根据句意，得出答案．

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