题目

Simple ways to get happy We are not suggesting that you can reach a permanent state called “happiness” and remain there. But there are many ways to turn the path of anxiety, anger, and sadness into a state of happiness. Here are four ideas to get you started.    36     . 1. Laugh out loud. Just expecting a happy, funny event can raise levels of pleasure-causing hormones (荷尔蒙) and lower production of stress hormones. Researchers at the University of California tested 16 men who all agreed they thought a certain videotape was funny. Half were told three days in advance th匀加速直线运动的物体从A运动到C所用时间为t，B是AC连线上的一点，已知物体在AB段的平均速度为v。在BC段的平均速度为3v，则物体加速度的大小为____▲____。