题目

 ——Did you know any French before you arrived in Washington?  ——Never ____ it, actually.                                    A. had I learned     B. have I learned     C. I learned     D. was I learning 答案：A从一块短轴长为2b的椭圆形玻璃镜中划出一块面积最大的矩形，其面积的取值范围是[3b2，4b2]，则这一椭圆离心率e的取值范围是（　　）A．[53，32]B．[33，22]C．[53，22]D．[33，32]