My mother insisted that I _____to school on foot.
A.went
B.goes
C.go
D.going
答案:C
I'm not surprised that he became a writer. Even as a child he had a(n) __________imagination. [ ]
A. clear
B. elegant
C. funny
D. vivid
对人的性别起作用的是 ( )
A.蛋白质
B.性染色体
C.细胞
D.配子