12．A group of young Americans have come to Beijing for a visit．Half of them，___is，50persons，can speak Chinese fluently．（　�。�
A．thatB．whichC．whoD．it

分析 一群年輕的美國人來北京參觀．其中半數(shù)人，即50人，可以講流利的中文．

解答 答案：A．that is即是，就是說，為固定搭配，是對half of them的進一步解釋說明，在句中做插入語成分，故選A．

點評 本題考查插入語的用法，插入語在句中語法上是獨立的，逗號隔開插入語與句子其他成分，可觀察逗號及刪去對句子表達有無影響來判斷是否為插入語．

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