4．In Sydney，there's only ________ average of 23days a year when ________ sun doesn't shine．（　　）
A．the，theB．an，/C．an，theD．the，/

分析 在悉尼，一年平均有23天的時間沒有陽光．

解答 答案：C
固定短語an average of 意為：平均…，因此第一個空填an；由于sun表示世界上獨(dú)一無二的事物，因此要在它的前面加定冠詞the；故選C．

點(diǎn)評 本題考查冠詞的用法；做本題時，首先應(yīng)掌握固定短語an average of 的意義及用法；其次要知道：在表示世界上獨(dú)一無二的事物的前面加定冠詞the的用法；最后除了要牢固掌握含有冠詞或零冠詞的固定短語外，還要注意總結(jié)定冠詞，不定冠詞以及零冠詞的其他用法．

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