17．--I've heard that most schools have banned         junk food and brought out new menus．
--"That's cool"said Andrew，       11th grader．（　　）
A．/； anB．/； theC．the； aD．the；/

分析 --我聽說大多數(shù)學(xué)校都已經(jīng)禁止垃圾食品，并推出了新的菜單．
--"太棒了"，一位十一年級的學(xué)生 Andrew說．

解答 答案：A．
junk food 為一固定短語，屬于不可數(shù)名詞，所以前面不用冠詞；而第二空表示泛指一位十一年級的學(xué)生，又因為11th的首字母e的發(fā)音為元音音素[?]，所以用不定冠詞an；故選A．

點評 定冠詞的選擇取決于冠詞后面詞的首字母發(fā)音，首字母發(fā)音為元音音素時用冠詞an，首字母的發(fā)音為輔音音素時用冠詞a記住這一點，問題迎刃而解．

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