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    This is ________ orange. __________ orange is yellow.

    A. an; The B. the; an

    C. the; The D. a; The

    A

    【解析】

    试题分析：句意：这是一个桔子。这个桔子是黄色的。冠词作为一种虚词，只能和名词一起使用。英语中的冠词分为不定冠词和定冠词。不定冠词有两个，a 和 an。a用在辅音开头的单词前面；an用于以元音开头的单词前。不定冠词用在单数可数名词前面，表示这个人或事物是泛指的不确定的一个，相当于中文的“一个”。定冠词和名词连用，表示某个或某些特定的人或东西。 第一个orange表示泛指，orange以元音音素开头。后一个表示特指。所以选A。

    考点：考查冠词。

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