从能量转化的角度看，原电池是一种将_______转化为______的装置。组成一般原电池的三个基本条件是：① ___________，②_____________，③___________ 。原电池中负极发生________反应（填“氧化”或“还 原”，下同），正极发生_______反应，电子从_______极经导线流向_______极（填“正”或“负”，下同）电流从_______极经导线流向______极。
化学能；电能；活泼性不同的两极；电解质溶液；形成闭合回路；氧化；还原；负；正；正；负
Stress is everywhere in our everyday life. Not only men have it, but also women and young people. The most important reasons of stress are: death, diseases(疾病), exams, making money, getting married(结婚), moving houses, changing jobs, ending friendship and so on. How do you know whether you have stress? Could you give your answers to the following questions? Stress Test
Doing relaxing exercises, talking with friends and listening to light music are all usual ways of relieving（减轻）stress. However, doctors now say that there are easier ways—people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should X_ more often ,because crying is the natural way of relieving stress. 小题1:Which of the followings is NOT the reason of stress?
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