【正文】
safety. on physical education and extracurricular activities to prepare before the warmingup, attention should be paid to exercise when not to dramatic collision, so as not to be knocked down or fall. 5, it is necessary to pay attention to internet security. network is a very good learning tool, we can use it to gather information, broaden our horizon. but the network also has a lot of harm, if unhealthy internet browsing web pages, or indulge in unrestrained virtual space, then it will affect our physical and mental health. 6 students for their own actions but also have safety awareness