第二节书面表达(满分25分)One possible versionDear lucy,I am Li Hua, chairman of the Students'Union. I am writing here to extend our sinceregratitude to youDuring the COVID-19 pandemic last year, you were trapped in your country and couldntreturn to our school. However, it was lucky that you used the Internet to give lessons. All thestudents said that you put your heart into making the lessons interesting. As a consequence,though you were still in England, we had no trouble in continuing new lessons this term, whichmade us so proud of being taught by youLooking forward to your early returnLi Hua

33.(1)ABE解析:温度是分子平均动能的标志,所以温度不变,分子的平均动能不变,故A正确;物体的温度越高,分子热运动越剧烈,故B正确;物体的内能就是物体内部所有分子的动能和分子势能的总和,故C错误;布朗运动是由液体分子之间的不规则运动引起的,故D错误;改变内能的方式有做功和热传递,外界对物体做功物体的内能不一定增加故E正确(2)解:①V1=24S,V2=L2S(1分)2=A+智6=(1.0×10+2x10=)P2=2×1P(1分)由等温变化pV1=p2V2,V=LS,(1分)得L2=20cm(1分)②设活塞到卡环时温度为T3,此时V3=36S(1分)由等压变化子=(1分)得T3=540K.(1分)由540K到675K为等容变化(1分)由会=会得p=15×10P(2分)

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