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(guó)人來(lái)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(shuō)，為固定搭配，是對(duì)half of them的進(jìn)一步解釋說(shuō)明，在句中做插入語(yǔ)成分，故選A．

點(diǎn)評(píng) 本題考查插入語(yǔ)的用法，插入語(yǔ)在句中語(yǔ)法上是獨(dú)立的，逗號(hào)隔開(kāi)插入語(yǔ)與句子其他成分，可觀察逗號(hào)及刪去對(duì)句子表達(dá)有無(wú)影響來(lái)判斷是否為插入語(yǔ)．

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