1.(    )
A.                         B.                               C.                         D.
2.抛物线的焦点坐标为     
A.                      B.                   C.                      D. 
3.已知函数,则的值为     
A.                B.                C.                D. 
4.已知椭圆的一个焦点坐标为,则的值为(    )
A.                                B.                                C.                                D.
5.某种产品的广告支出费用单位:万元与销售额单位:万元之间有如下关系:
 
已知与的线性回归方程为,则当广告支出费用为万元时,残差为     
A.                           B.                            C.                            D. 
6.函数的导函数的图象如图所示,则(   )
A.为的极大值点
B.为的极大值点
C.为的极大值点
D.为的极小值点
7.函数在[-1,1]的最大值是  
A. e                               B. –e+1                        C. e+1                           D. e-1