A、 a
B、 an
C、 the
D、 /
答案:C
A、 a
B、 an
C、 the
D、 /
答案:C
A. cleaned
B. will clean
C. was cleaned
D. is cleaned
A. 4
B. 3
C. 2
D. 1
A. moves
B. moved
C. is moved
D. was moved
A. 0∈A
B. 3/4∈A
C. {0}包含于A
D. -π∈A
A. a
B. the
C. /
D. an
A. save
B. saving
C. saved
D. to save
A. without
B. under
C. with
D. for
A. 20
B. 22
C. 24
D. 25
A. When
B. Where
C. How
D. Which
A. {x|-3<x<3}
B. {x|x>3或x<-3}
C. {x|-3≤x<3}
D. {x|x≥3或x<-3}