材料：“候鸟式”养老是当今兴起的一种新型养老模式。不少北方老年人选择冬季到南方的城市居住、旅游，北方天暖后再回到原地居住。近年来老钢铁工业城市攀枝花已成为我国冬季养老的热点城市之一。2015年来此过冬养老人数近10万，攀枝花正在实现由“钢城”向“阳光花城”的转型。下图为四川省攀枝花市区位示意图。

人体内的哪类物质不提供能量（　　）

一只空心球总体积为V，球腔容积为V／2，当腔内不灌水时，它在水中有一半露出水面，若将球腔内注满水再放入水中，则（）

   I am Bill Jones. I am a teacher of English. My wife is Linda Jones. She is a nurse. We have a daughter and a son. We have many friends.
Look! These are my friends. This is Mr. Black. He is a worker. He works in a shoe factory He makes shoes there. That’s Mrs. Black. She is a worker on a farm near here. The girl is their daughter. She is a student. She is thirteen. The boy is their son. He is a young soldier（战士）. His name is Carl Black.