2021-2022八年级英语周报第39期答案

【参考范文】One day, Spotty returned from his daily walk with a broken leg. Appearing exhausted, he came to myroom and sat near me, the leg bleeding. I called my mother and she quickly tied a bandage around his leg andgave him food to eat. I was very upset. But the next day, Spotty followed me wherever I went happily asusual though he limped a bit. After this incident my relation with Spotty became more intense. I reallyadmired him a lot for his courageAlmost a year later, one midnight we heard Spotty barking breathlessly. We rushed out and saw himbarking continuously, heading somewhere. After some time Spotty became quiet. I patted him on his backand came inside. The next morning, my heart skipped a beat when I didn't see Spotty. I searched for him ineach and every corner but in vain. And this time he had gone and would never come back. I cried and waitedfor him. But there were no signs of him and I only say him looking at me with his sparking eyes in my dream

BDF【解析】做功和热传递在改变物体内能上等效,前者是能的转化后者是内能的转移,本质不相同,A错误:温度是分能的标志,B正确:机械能可以全部转化为内能,而内能也能全部转化为机械能,但会发生其他变化,C错误:对物体做少物体可能放热,内能不一定增大,D正确:分子间同时存在着相互作用的引力和斥力,它们都随分子间的距离减小而增大,E(2)解:设缓缓倒入相同的液体两侧液面等高后,理想气体被压缩了△r,由玻意耳定律有(Po-gh)h=p(A-△x)(4分)解得△x=-(3分)Oh则要倒入液体的高Mh=x++h=h(3分)L

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