题目内容
17．There is ___ apple on the table．___ is Tom's．（ ）| A． | the，that | B． | an，it | C． | a，it |
分析 桌子上有一个苹果．它是汤姆的．
解答 答案为B．不定冠词a，an用在可数名词前，表示泛指任何一个，a与an的区别是a 用在辅音音素之前，an 用在元音音素之前．定冠词the用在名词前，表示特指某一个．句子apple是任意的一个苹果，而apple第一个字母的发音是元音，故可以排除C，A．it与that的区别，it是物主代词，指一个固定的物体或者是人．that是指示代词，既可以指物，也可以指一件事．句子要用it来指代前文所提到的apple，指同类同物．故答案为B．
点评 这一题学生首先要懂得区分定冠词和不定冠词的用法，而且还得了解指示代词的用法．
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