题目内容
10．-Excuse me，Helen．What's this in English？-It's __________ tomato．（ ）
| A． | a | B． | an | C． | the | D． | / |
分析 -打扰一下，海伦．这用英语怎么说？
-它是一个西红柿．
解答 答案A．
a因为It's+可数名词单数/不可数名词，又由可数名词tomato（西红柿）看出空格处填a或an，tomato[t?'mɑ：t?u]第一个发音[t]是辅音音素，a用于辅音音素前，an用于元音音素前，故答案选A．a
点评 牢记a和an的用法口诀：a和an很相像，两种用法不一样；辅音音素a提前，元音音素an优先；代在名前来相伴，a和an看不见（名词前若有形容词性物主代词，就不用a和an）．
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