13．It is believed that_____ apple a day keeps the doctor away．（　　）
A．不填B．theC．anD．a

分析 人們相信：每天一蘋果，醫(yī)生不找我．

解答 答案：C    an apple a day keeps the doctor away每天吃一個蘋果可以讓人不生病，是常用的習語；句中apple表示泛指，且apple是以元音開頭，要用不定冠詞an來限定．故選C．

點評 冠詞是一種虛詞，本身不能獨立使用，只能放在名詞前幫助說明名詞所指的人或事物，它是英語詞性中最小的一類，只有三個，一種是不定冠詞a，an；一種是定冠詞the．此外也有些特定場合不用冠詞，即通常所稱的零冠詞．不定冠詞表示泛指，定冠詞表示特指

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