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【参考范文】She[文] wanted to get more help.Larr[章]ella took pictures of the library and uploaded them online,ca[来]lling on peo-ple to donate books to her library.B[自]efore long,hund[知]reds of new and secondhan[嘛]d books poured in.Larrel[答]la,herunc[案]le and cousin spent a whole week checking,[网]classifyi[文]ng and arranging[章] the books and putting them on theshelve[来]s.Tired as Larrella was,a smile lit up her face when she pictured the scene where children were buried inreading[自] by the book-fill[知]ed shelves.T[嘛]he big day finally came.With[答] everythin[案]g ready,the[网] library opened at last.At first several childrens[文]tepped in curiously[章],but obviously[来] eager to read the books.Lar[自]rella encourage[知]d them cheerfull[嘛]y.Some chosewhat[答] they liked,whi[案]le others hesitated[网].Realizin[文]g they had trouble reading,L[章]arrella gathered them in a corner,te[来]aching them from the very beginning[自].Soon more children joined in.Every night Larrella spared some time togive lessons so that more children could gain knowledge[知] from the books.Lar[嘛]rella's efforts opened the wisdomdoo[答]r for them,whic[案]h would surely make a great differenc[网]e to their lives.
33.(1)【答案[文]】ACD(5分)【[章]必备知识】分子动理[来]论、理想气体状态方[自]程、热力学第一定律[知]、内能、压强的微观[嘛]意义【解题思路】爆[答]胎前的过程,由于阳[案]光照射,车胎内的气[网]体会吸收热量,温度[文]升高,由分子动理论[章]可知,温度升高,分[来]子热运动加剧,气体[自]内能增加,分子的平[知]均动能增加,但气体[嘛]体积几乎不变,实际[答]气体分子间引力和斥[案]力的变化可忽略,A[网]正确,B错误;由理[文]想气体状态方程pV[章]=nRT可知,车胎[来]内气体质量不变,体[自]积不变,温度升高时[知],压强增大,由压强[嘛]的微观解释可知,分[答]子密集程度不变,温[案]度升高,分子平均动[网]能增大,故单位时间[文]内气体分子对单位面[章]积器壁的撞击次数增[来]多,C正确;车胎内[自]气体吸收热量,内能[知]增加,体积不变,外[嘛]界对气体不做功,由[答]热力学第一定律有△[案]U=W+Q,W=0[网],△U=Q,D正确[文],E错误。(2)【[章]关键能力】分析综合[来]能力【解题思路]([自]i)设玻璃管的横截[知]面积为S,玻璃管开[嘛]口朝上竖直放置时,[答]对封闭空气柱有PI[案]=Po +pgh =80 cmHg, V,=LS(1 t)平放在水平桌面[网]上时,有P2=P0[文]=75cmHg,V[章]2=l2S空气柱发[来]生等温变化,由玻意[自]耳定律有p1V1=[知]P2V2(2分)解[嘛]得L2=16cm([答]1分)Gi)当玻璃[案]管开口朝下竖直放置[网]时,设封闭空气柱长[文]度的改变量为△L([章]如图所示),此时封[来]闭空气柱的压强为P[自]3=P0-pgh-[知]2g△L=(70-[嘛]2△)cmHg(1[答]分)V3=(L1+[案]△L)S
