_example of animal withoutbackbone is th

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/07 13:46:25

_______example of ________animal without______backbone is the earthworm.请问,这里三空填什么冠词?
答案是（An,an,a）,为什么?特别是第二空为什么要用an?

因为animal 首字母是a在这个单词里是表示元音.所以用an.跟第一个example之前填an是一个解释啊.同理,backbone中b是辅音,所以用a.
再问：为什么不能用the ? the +单数名词，表种类它的选项是 A:the, an, the B:an.an, a c:the ,the,the d:an ,the ,a
再答：因为这个an不只是表示的一个它还能表示泛指，也就是这个种类的动物。在动物的名词前面一般就是用a,an,而the表示种类的时候后面假的基本上都是非生命体，也就是没有生命的名词，像是the cup.而且the 大部分是特指，不是泛指。

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