C．                                                  D．

        A．                                                  B． 

3．已知是的反比例函数，点A（-3，1）是其图像上一点，则函数的关系式为

C．                                                D．

        A．                                                B．  

2．的运算结果是

C．                                                     D．

A．                                                      B．

1．若分式有意义，则的取值范围是