题目

已知双曲线的两个焦点分别为、，双曲线与坐标轴的两个交点分别为、，若，则双曲线的离心率 A．            B．            C．            D． 答案：A 用下面方框中的句子完成下列各题。 A. How do you like China?B. I'm from Australia． C. What do you like about China? D. What does your brother do? E. Where do you study? A: Good morning, Tom. B: Good morning, Lucy. A: Where are you from?B: 1.                                                         A: What do you do?B: I'm a student. A: 2.                                                         B: I study in NO.8 Middle School. A: 3.                                                        B: He is a student, too. A: 4.                                                         B: We like China very much. A: 5.                                                        B: We like the Chinese people and food.