1、题目56:在等比数列{an}中,a2=2,公比q=2,则此数列的前3项和为( )

A. 　can＇t

B. 　musn＇t

C. 　needn＇t

D. 　shouldn＇t

A. 　{x|-1<x<3}

B. 　{x|x>3或x<-1}

C. 　{x|-3<x<1}

D. 　{x|x>1或x<-3}

A. 　π

B. 　2π

C. 　π/2

D. 　π/4

A. -1

B. 0

C. 1

D. 　不存在

A. 　not to be late

B. 　not being late

C. 　to be late

D. 　being late

A. 　don＇t

B. 　didn＇t

C. 　wouldn＇t

D. 　won＇t

A. 　can

B. 　must

C. 　should

D. 　is supposed to

A. 　will watch

B. 　was watching

C. 　watched

D. 　have watched

A. 0

B. 1

C. 2

D. 3

A. 　go

B. 　to go

C. 　goes

D. 　went