题目

—I believe we've met before． —No，____．I've never been here before．(重庆课改实验区) A．it isn't the same                  B．it's true                        C．I don't think so           D．I believe so 答案：C解析：下句是对上句的内容提出相反的观点，故用表示否定的答语：I don't think so．如果表示赞同要用I think so．故选C。双曲线y=2x的两支分别位于第 、 象限．