英语周报54期2021-2022答案

第二节One possible version:I had made a fool of myself and every girl in the seventh grademust be laughing at me. The next day at school, when I wasn'tthe focus of every joke, I realized that Nicole could not have saidanything. Only then did i have time to think about how deep I hadhurt her definitely. As I knew, she was not an outgoing kind of girlHow hard must it have been for her to cross over to invite me. Butmy ridiculous reaction ruined everything. I couldnt help thinkingwhat I could do to make it up to her.With October came another dance. On stepping into thegym, I anxiously looked for Nicole. There she was, sitting in acorner, paying close attention to all the dancing couples. Takinga deep breath, i gathered courage to step forward. Lady, may Ihave the honor to dance with you? "I reached out my hand to her.We started to sway. We trusted each other. This time, everythingwent perfectly. This was my first dance, which led to my fullunderstanding of bravery, and most importantly, of dance

33.(1)向右移动(3分)低于(2分)【解析】活塞被锁定时,两部分气体温度相同,分子平均动能相同,a部分气体的分子密度大于b部分气体的分子密度,a部分气体分子单位时间内对活塞的撞击次数大于b部分气体分子单位时间内对活塞的撞击次数,必有a部分气体压强大于b部分气体压强。解除锁定,活塞将向右移动;a部分气体推动活塞对外做功,活塞压缩b部分气体对b部分气体做功,因系统绝热,根据热力学第一定律,a部分气体内能减少,b部分气体内能增加。因氧气可看做理想气体,所以a部分气体温度降低,b部分气体温度升高,a部分气体的温度低于b部分气体的温度。(2)【解析】(1)温度为T。时,设缸内气体压强为户,细绳上拉力为F,对左侧活塞由平衡条件得p1StF=poSting(1分)对右侧活塞由平衡条件得p·35+F=p·3S2ng(1分)两式联立可得p2A、少mTz(2分)(‖)当温度降为T时,两活塞等高,设缸内气体压强为p2,由平衡条件得P2S+F=pS+mgp2·3s+F=p·3S+2mg可知p2=≈mg,气体做等压变化(2分)初态V1=÷hS+3S,末态V2=(+÷)hS+3(hh)s(2分)根据盖一吕萨克定律得T(1分)联立解得T=300K(1分)

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