房屋拆迁公告要明确()
A、拆迁人
B、被拆迁人
C、拆迁范围
D、拆迁期限
E、建设项目
参考答案：A, B, C, E
— Roy said that his sister is in the sixth grade.
— _______? My sister is already in Junior High . [ ]
A. So what
B. What for
C. How so
D. How come
函数f（x）=x3+ax2+3x﹣9，已知f（x）在x=﹣3时取得极值，则a=[ ]
A．2
B．3
C．4
D．5
