“三家分晋”中的“三家”是指
①燕国②赵国③魏国④韩国⑤齐国[ ]
A．①②③
B．②③④
C．①③④
D．③④⑤
答案：B
下列函数中既是奇函数，又在（0，+∞）上单调递增的是（ ）
A．y=x2
B．y=x3
C．y=-x
D．y=tanx
The essay you wrote is excellent, which a rapid improvement on your recent work.
A．illustrates
B．explains
C．represents
D．communicates
