A、14
B、21
C、28
D、35
答案:C
A、14
B、21
C、28
D、35
答案:C
A. sits
B. sat
C. is sitting
D. was sitting
A. {x|-3<x<3}
B. {x|x>3或x<-3}
C. {x|-3≤x<3}
D. {x|x≥3或x<-3}
A. which
B. when
C. whether
D. since
A. 0
B. 1
C. 2
D. 3
A. no
B. less
C. more
D. most
A. don't
B. didn't
C. wouldn't
D. won't
A. π
B. 2π
C. π/2
D. 4π
A. 20
B. 22
C. 24
D. 25
A. What
B. What a
C. What an
D. How
A. a
B. the
C. /
D. an