选修4-4：坐标系与参数方程在平面直角坐标系 xOy 中，曲线 C1 的参数方程为 {x=2cosαy=2+2sinα （ α 为参数），以原点 O 为极点， x 轴的正半轴为极轴建立极坐标系，曲线

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选修4-4：坐标系与参数方程

在平面直角坐标系 xOy 中，曲线 C1 的参数方程为 {x=2cosαy=2+2sinα （ α 为参数），以原点 O 为极点， x 轴的正半轴为极轴建立极坐标系，曲线 C2 的极坐标方程为 ρcos2θ=sinθ （限定 ρ≥0,0≤θ<π ）.

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从b栏中找出与a栏中相对应的答语。

a	b
Can I help you?____	B. The same to you.
When is his birthday?____	C. I don't know.
Happy New Year!____	D. No, I can't.
Do you have a tennis racket?____	E. No, I don't.
Can you play chess?____	F. That sounds great.
Are these your parents?____	G. It's fifteen dollars.
Does Gina like comedies?____	H. History.
How much is the blue sweater?____	I. May, 5th.
What is your favorite subject?____	J. No, they are my uncle and aunt.
Let's play soccer ball.____	A. Yes, please.