椭圆C： $\frac{x^2}{4}+\frac{y^2}{3}=1$ 的上、下顶点分别为A₁、A₂，点P在C上且直线PA₂斜率的取值范围是﹣2，﹣1，那么直线PA₁斜率的取值范围是____．

鱼和鸟的身体都呈____形，便于减小运动时产生的____。鸟有____无齿，有____辅助____的呼吸，提高了气体交换的效率。  

Despite the fact that there are a lot of complaints about ________  CCTV’s annual Spring Festival Gala(Chunwan),most people think it was really ________ feast for our eyes this year.

下列说法正确的是（   ）

请根据老师与同学们的对话，为衣物找到主人。
A: Is this your cap?
B: No, it's Mary's.
A: Is this your skirt, May?
B: No, it isn't. It's Lily's.
A: Is this your skirt, Lily?
C: Yes, it is.
A: Are these your gloves?
C: No, they aren't. They are Tom's.
A: Are these your shorts, Li Hai?
D: Yes, they are.
A: Whose scarf is this?
D: It's May's.
⑴Mary  ____                A.
⑵Lily  ____                 B.
⑶Tom  ____              C.
⑷Li Hai  ____               D.
⑸May  ____                E.