热爱学生是教师的天职，是教师必须具备的情感品质。()
参考答案：对
函数f（x）=x3+ax2+bx+a2，在x=1时有极值10，那么a，b的值分别为（ ）。
I would rather you did some reading while you are free, but you ______. [ ]
A. don't
B. didn't
C. wouldn't
D. weren't
