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18.-What do you think of the nature reserve you visited last weekend?
-It's great.It is ______ ideal home for wildlife.(  )
A.aB.anC.theD./

分析 ---你认为你上周参观的自然保护区怎样?
---很好,是野生生物的理想的家.

解答 答案:B.结合It is ______ ideal home for wildlife用不定冠词表示泛指一个理想的家,ideal是以元音音素开头的,故用an,故答案是B.

点评 a和an都是不定冠词,表示一(个,支,本,块…)的意思,但不强调数量概念,而是强调类别,用来限定名词.a用在辅音音素开头的单数名词前,如:a 
pencil(一支铅笔),a book(一本书);an用在元音音素开头的名词前,如an 
eraser(一块橡皮).如果名词前有修饰语,用a还是用an,则以该修饰语的第一音素决定用a还是用an.

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