________dictionary is________useful book．


  1. A.
    A，a
  2. B.
    The，the
  3. C.
    A，the
  4. D.
    /，/
A
分析：1．不定冠詞可以用來表示“泛指”概念，就是“類”的概念。A dictionary is a useful book．(詞典是有用的書)表示的是“只要是詞典”的意思。A和An都是不定冠詞，區(qū)別是：輔音聲音前用a；元音聲音前用an．此處useful的首字母是元音字母u，但發(fā)本身音，是輔音聲音開始，所以用a．(延伸)1)大部分以輔音字母開始詞是以輔音聲音開始的，要注意以h開始的單詞，如果h不發(fā)音，就是元音聲音開始，前面應該用an；如果h發(fā)音，就是輔音聲音開始，前面用a．如：an hour，an honest man/a history book，a half，a hall．2)y是單詞的首字母時，不是元音字母，發(fā)輔音聲音，前面用a：a young man，a yard．3)元音字母u是單詞的首字母時，如果u發(fā)本身音，前面用a；反之用an，如：a useful book，a university/an uncle，an unforgettable day，an untidy room．4)元音字母e是首字母時，前面用an，但如果e不發(fā)音就要用a：an English song/a European country．5)首字母是a，i，o時，前面用an：an apple，an invitation，an office．
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