(B)

    Everyone knows that exercise is important．We all need to exercise．Doctors say it is good for us．It makes your heart and body strong．Children who often exercise are more alert(灵活的).That means they do better in tests and schoolwork than those who don't exercise．

    There are many ways to exercise．You can walk，run，swim，skate or play ball games．Make sure you exercise in the following ways：You have to like what you are doing．Exercise enough--but not too much．It's best to exercise twice a week．Thirty minutes each time is enough．Try all kinds of sports until you find one，two or three sports that feel right for you．

    You can exercise at fitness centers．They have a lot of equipment(设备)there．The equipment will help exercise your arm，legs and other parts of your body to make you healthy．Some people buy equipment for their homes．But it's very expensive．Exercising can be fun．Friends can exercise together at fitness center，or they can play sports together．How do you exercise?

 在“探究水沸腾时温度变化的特点”实验中，得到的实验数据如表格所示：

材料：秦开美，湖北省潜江市浩口镇第三小学的教师。2014年6月10日上午，身带自制炸药、手枪和汽油的农民张泽清闯进秦开美的课堂，将她和52名学生劫持。在此后的40分钟里，秦开美与张泽清周旋，主动留下来当人质，让所有学生安全撤离。秦开美被网友赞为“最美女教师”。 秦开美1988年开始在浩口镇柳洲村小学当民办教师，她的毕业班语文课教得非常好。1994年浩口镇柳洲小学停办，由于秦开美的语文教学水平在浩口管理区小有名气，浩口镇第三小学聘请她作代课教师。26年里，秦开美错过两次转正机会，一次因年龄太小，一次因年龄太大。县城一所私立学校以高薪聘请她，被她拒绝了，她不愿离开待了十几年的浩口镇第三小学。秦开美被评为2014年“最美乡村教师”。
阅读上述材料，运用所学知识，从“为他人开一朵花”、“走近老师”两方面并联系本人实际谈谈你的感悟。