书面表达One possible version:Dear PeterI'm writing to invite you to attend a lecture about exercise and health in our schoolAs you know, there are many students who are overweight or short-sighted in our school. They devote all their energy to studying andignore exercise. As a result, they are not so strong and healthy as they should be. Besides, some girls choose to keep slim by controlling thdiet, which also affects their health. So we hope to promote some health knowledge through this lecture: The lecture, which is to be held in theschool hall next Friday afternoon, will last from 3: 00 pm to 5: 00 pm. I hope you can attend it and share something with us.ooking forward to receiving your early replyYours sincerely

29.(1)三颈烧瓶(2分);通过观察装置A中产生气泡的速率来调节气体的流速(2分)(2)2Ch+Na2CO=Cl2O+(O+2NaC(2分);该反应放热温度升高(l2O会分解(2分)(3)2Fe3++3C厂-+10OH=2F)-+31-+5H2O(2分);生成的K2FeO在Fe+和Fe(OH)3的催化作用下会发生分解(或其他合理答案,2分)(4)82.5%(2分)

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