题目

Whether you like it or not, your parents are responsible(负责任的) for you, at least until you’ re out of high school. But does it feel like your parents are stressing you out with their love? Do you often fight with them?    Hu Muqing, 16, of Shenyang, complains that his parents only care about his grades and not his other needs. He and his parents fight the most about the time he spends watching TV and on the Internet. The Shenyang teenager said, “They think I should concentrate on my work because I’m in middle school. However, I need to be able to relax. Most of my friends can 下列各加点物体可视为质点的有A.研究地球的昼夜交替B.运动员发球时用球拍使乒乓球旋转，研究其旋转情况C.计算箱子对地面的压强D.用GPS确定远洋海轮在大海中的位置