题目

方程=的实根有    (      )       (A) 1个  (B) 2个  (C) 3个  (D) 无穷多个 答案：C 解析:作y=与y=的图象,从图中可以看出:两曲线有3个交点,即方程有3个实根.选(C)He dressed up and went to the party as if ___________. A. was invited                                          B. had been invited  C. invited                                                        D. to be invited