根据短文内容，选择正确答案。

Mike is a middle school student. He is 16 years old. He had a bad cold last night. He felt bad and couldn't eat anything. So he went to see a doctor. The doctor gave him a bottle of medicine. But he doesn't know when to take the medicine. Can you tell me what the doctor means? These are the instructions (用法说明):

已知抛物线C：y²=2px （p＞0）的焦点为F，过点F倾斜角为60°的直线l与抛物线C在第一、四象限分别交于A、B两点，则 $\frac{\left|AF\right|}{BF}$的值等于____

某人患急性肠胃炎引起腹泻，医生给予补充生理盐水（0.9﹪）其首要目的

西亚的气候特点是（  ）