下列函数关系中，可以看做二次函数y=ax²+bx+c模型的是（　　）

如图所示，人造卫星A、B在同一平面内绕地球做匀速圆周运动．则这两颗卫星相比（   ）

 根据汉语提示写出单词。 
1.The good news____（传播）fast. We are very happy to hear it
2. You look ____ (苍白)， what's wrong with you?
3. Take this____(药) three times a day.
4.He coughs ____ (日日夜夜)
5.While we are in class, we should take an ____（活跃）part in all the activities.
6. Doing more exercise like running helps to____ (增强)our body.
7. All of us should ____(戒除) smoking.
8.I want go be a doctor ____ (将来)
9. Mum, don't (担心)____me. I'll take good care of myself.
10. Why don't you ____  （躺下）？