题目内容


--- What’s this?
--- It’s             .
A．an ID card B．a orange
C．rulerD．an UFO
A

试题分析：A. an ID card   I的发音是[ai]元音，故用an; B. a orange [??]元音开头，故用an,错误。
C. ruler 可数单数名词不能单独用，要在前面加a; D. an UFO [ju: ef '??]第一个发音是辅音，所以用 a,选项错误。故选A
点评 ：一定要看第一个发音，而不是第一个字母，易错的有：an hour , a half.
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