第一节 (共5小题；每小题1.5分，满分7.5分)

请听下面5段对话，选出最佳选项。

1. What does the man mean?

A． The food should be kept warm.

B. They should have eggs for dinner.

C. It’s extremely hot outside.

2. What is the price of the chair now?

A. $50　　　 B. $15　　　 C. $65

3. What does the man think of his friend Sam?

A. Selfish.　　 B. Kind-hearted.　　 C. Open-minded.

4. What can we learn from the conversation?

A. The woman has good eyesight.

B. The speakers both see the kite.

C. The man has poor eyesight.

5. Where does the conversation most probably take place?

A. At the doctor’s.　　 B. In front of a computer.　　 C. In the classroom.

22.(本小题满分12分) 已知椭圆的中心在原点，焦点在x轴上，长轴长是短轴长的2倍且经过点，平行于的直线在轴上的截距为m(m≠0)，交椭圆于A、B两个不同点.

　 (Ⅰ)求椭圆的方程；

　 (Ⅱ)求m的取值范围；

　 (III)设直线、的斜率分别为 ，求证.