a horse is an animal

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a horse is an animal
为什么NAIMAL前面要加AN,

请记住,英文中的名词,一般情况下都不能光秃秃的,一定要有冠词.定冠词,不定冠词必须择一,或者是复数形式.比如：
A bee is an insect. ---- an
Bees are insects. ----pl.
The bee is flying around the tree. --- the
Bees are flying around a tree. --- a
Bees are flying around trees. --- pl.

a horse is an animal A cow is as strong an animal as a horse. a zebra horse(an animal that is a cross between a zebra and A horse is a useful animal和The horse is a useful animal ( )horse is ( )useful animal. An elephant is _____ than a horse. An elephant is ( )(big) than a horse. 改错：A fox is an useful animal. Everyone understands that （） horse is （） useful animal A a;a A horse is a useful animal 两处为什莫都用a an animal还是a animal horses are useful animals/ a horse is a useful animal.马是有用的动