下列现象与物态变化相对应的是（　　）

Pedro: Hi, Lily. When do you start class in the morning?

Lily: Usually at 8:00.

Pedro: It's early. We start class at 9:00 in Spain.

Lily: When do you usually eat dinner, Pedro?

Pedro: At 9:30 or 10:00 p.m.

Lily: Wow! That's too late. I always go to bed at 9:30. What do you do on the weekend?

Pedro: I often play sports with my friends. Sometimes I go shopping with my mum.

Lily: Sounds interesting. I usually clean my room. Sometimes I cook for my family.

新中国诞生后，群众性的体育活动普遍开展起来。更对学生提出了“健康第一”的要求。提出这一要求的是（  ）

根据开普勒定律可知：火星绕太阳运行的轨道是椭圆，太阳处在椭圆的一个焦点上．下列说法正确的是（   ）