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

分析 眾所周知，地球圍繞太陽轉(zhuǎn)．

解答 答案：D．
分析句子結(jié)構(gòu)以及主句前面的逗號可知，___ is known to all是非限制性定語從句，故排除A、B；which引導(dǎo)的非限制性定語從句不可以位于句首，故排除C，as is known to all是固定搭配，"眾所周知"，所以選D．

點評 本題考查定語從句．做這類題型時，首先要判斷從句是否是定語從句；然后分析從句的句子成分，缺主語、表語、賓語、定語用關(guān)系代詞，缺狀語時用關(guān)系副詞；最后看先行詞，根據(jù)句意，得出答案．

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