阅读理解短文，然答问题。
Today is Sunday. The weather is warm and sunny. I'm a girl. My name is Lisa. I'm wearing a pink dress
and red shoes. I want to go shopping today. I go to the department store by bicycle. I want to buy some books
in the book department. Then I want to buy a dress in the clothes department. Now I'm hungry. I want to eat
lunch in the restaurant. I eat rice, fish and vegetables for lunch. After lunch, I eat an ice cream for dessert. In
the afternoon, I play basketball with my father and mother. Today I'm very happy!
1. What day is today?
_______________________________________________
2. What's Lisa wearing today?
_______________________________________________
3. How does Lisa go to the department store?
_______________________________________________
4. What's for lunch?
_______________________________________________
5. What does Lisa do in the afternoon?
_______________________________________________
自平台上以速度
水平抛出，刚好落在邻近一倾角为
的粗糙斜面
顶端，并恰好沿该斜面下滑，已知斜面顶端与平台的高度差
，粗糙斜面
倾角为
，足够长。物块与两斜面间的动摩擦因数均为
，
点离
点所在平面的高度
。物块在斜面上运动的过程中始终未脱离斜面，不计在
,
。（
取
）
正好通过
点，求