_television is more useful than _radio.A A,a B An,an C The,t

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_television is more useful than _radio.A A,a B An,an C The,the D /,/
选什么?
_car was invented by a scientist,but _tea was found by accident.
A A,the B The,/ C /,a D The,the

A
再问：为什么不是C， a或the放在单数名词前都可以表示种类，区别是什么？
再答：英语中，指类别时应该用不定冠词加单数形式，或者是用复数形式（此时不要冠词）。

_television is more useful than _radio.A A,a B An,an C The,t The dog is (a/an/the//) useful any more ___ elephant is ___ useful animal.A.An;an B.An;a C.Thn;an D. This is a ( ) useful advice A a B an C the D 应选哪一个 He thinks that a computer is( )useful friend.A.a B.an C.the English is 什么 useful language in 什么world A.an,the B.a,the C. This is ______ useful book. A. a B. an C. the D/ This is ___ useful dictionary .选择：A.an B.a C.the D./ an elephant is ( ) bigger than a horse A a lot B more C much A computer is more useful than an MP3.同义句转换 an eiephant is-useful animal的横线应填什么?A.a B.an C.the D./ The UFO is___smaller than my paw.a.much b.even c.more d.a an