20．--My daughter seldom has ______dinner．
--It is_____ unhealthy habit．You must ask him to change it．（　　）
A．/；anB．the；anC．/；aD．the；a

分析 我女兒很少吃晚飯．
這是一種不健康的習(xí)慣，你必須要求她改變它．

解答 答案：A．根據(jù)語境dinner（晚餐）可知，一空處應(yīng)為零冠詞（三餐前零冠詞），根據(jù)語境unhealthy （首音素/?/為元音音素）habbit（單數(shù)名詞）可知泛指一種習(xí)慣，故第二空為an，故答案為：A．

點(diǎn)評(píng) 本題考查冠詞的用法，泛指一類人或物用a或an．元音音素（注意不是元音字母）開頭單詞前用an，輔音音素開頭單詞前用a．特指某人、某物及樂器前用the．三餐前零冠詞．

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