A、 3∈A
B、 1∈A
C、 0∈A
D、 -1∉A
答案:C
A、 3∈A
B、 1∈A
C、 0∈A
D、 -1∉A
答案:C
A. y=-x+3
B. y=-2x
C. y=-2x+1
D. y=5x+3
A. planted
B. plants
C. will plant
D. is planting
A. I go,too
B. so will I
C. neither will I
D. so do I
A. serious
B. more serious
C. most serious
D. the most serious
A. which
B. when
C. whether
D. since
A. putting off
B. putting on
C. putting down
D. putting away
A. a
B. an
C. the
D. /
A. Don't
B. Doesn't
C. Aren't
D. Can't
A. π
B. 2π
C. π/2
D. π/4
A. Two
B. The second
C. Five
D. The fifth