题目

A computer ________think for itself, it must be told what to do. A. can’t                        B. couldn’t                     C. may not                  D. might not 答案：A10．若关于x的一元二次方程kx2-2x-1=0有两个不相等的实数根，则k的取值范围是（　　）A．k＞1B．k＞-1且k≠0C．k≥-1且k≠0D．k＜1且k≠0