3．一What do you think of the grammar book？
一Oh，it is really      useful book，which is worth reading      second time．（　�。�
A．an； aB．an； theC．a； aD．the； the

分析 -你覺得這本語法書怎么樣？-哦，它確實是一本很有用的書，非常值得再讀一遍．

解答 正確答案：C．根據(jù)句意第一空泛指這是一本有用的書，且useful首字母發(fā)輔音音素/ju：/，故用不定冠詞a，按排除法可直接排除ABD，故選項C．第二空是序數(shù)詞前用不定冠詞a，表示再、又．worth doing sth．表示某事值得做．

點評 本題考查不定冠詞a，基礎題也是易錯題，如不認真審題第二空部分同學看到序數(shù)詞前應用定冠詞the而誤選D項，所以一定要仔細審題，掌握不定冠詞a的用法．

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