A、 open
B、 to open
C、 opened
D、 opening
答案:B
A、 open
B、 to open
C、 opened
D、 opening
答案:B
A. {x|-2<x<2}
B. {x|x>2或x<-2}
C. {x|-2≤x<2}
D. {x|x≥2或x<-2}
A. helping
B. helped
C. to help
D. help
A. 某班所有高个子的学生
B. 所有的正整数
C. 相反数等于它自身的实数
D. 倒数等于它自身的实数
A. oldest;older
B. the oldest;older
C. the oldest;elder
D. the older;elder
A. f:x→y=(1/2)x
B. f:x→y=(1/3)x
C. f:x→y=(1/4)x
D. f:x→y=(1/6)x
A. encourage
B. are encouraging
C. are encouraged
D. were encouraged
A. 4
B. 3
C. 2
D. 1
A. 6
B. 7
C. 8
D. 9
A. no
B. less
C. more
D. most
A. 0∈A
B. 3/4∈A
C. {0}包含于A
D. -π∈A