1.It’s generally believed that _____ for about a million years.
A.men have existed B.the menhave existed C.man has existed D.the man has existed
2.______classmate of mine was hit on ____ head by a naughty boy yesterday.
A.The,the
B A ,his
C. A,the
D.A ,a
3.This is _____ bike I promised to lend you _____other day.
A.an,/ B.an,the
C.the ,the D.the ,some
4.Many of ______tree growing in North China can be made into ____fine paper.
A./,a
B.the ,a C/,/ D.a ,the
麻烦说下原因。。。。
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