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C. twenty-four hours start D. twenty-four hours’ start
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12. Nowadays, of English is very important to a person.
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A. good knowledge B. a good knowledge
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C. the good knowledge D. good knowledge
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13. That couple has endured many emotional and financial .
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A. crisis B. crises C. crisises D. criseses
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14. After black clouds comes .
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A. clear weather B. a clear weather
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C. clear weathers D. the clear weathers
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15. Freedom is only good as a ; it is no end in itself.
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A. mean B. means C. meaning D. meanings
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英语语法红宝书 第3章 冠词
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冠词用在名词之前，表示名词所指的事物是否确定。冠词分为两类：不定冠词(a或an)和定冠词(the)。
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3.1 不定冠词
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3.1.1 不定冠词的用法
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a 表示数量“一”的概念，相当于one，但用不定冠词并不强调数量。
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A bird in the hand is worth two in the bush.
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一鸟在手胜过二鸟在林。
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A fall in the pit, a gain in the wit.
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吃一堑，长一智。
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Rome was not built in a day.
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罗马不是一天建成的。
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b 用于泛指，表示同类事物中的任何一个，相当于any。
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