2022英语周报九年级新目标39答案

33.(1)1.43×10-(2分)引力(2分)大于(1分)解析:由题可知,一滴油酸的总体积为1×20×200cm2.5×10-5=2.5×10-3cm3,则油酸分子的直径为10175m=1.43×10-m;液体表面的张力,是因分子间作用力表现为引力;当分子间作用力表现为引力时,分子间距大于液体分子的平衡距离(2)1取Ⅰ气体为研究对象,气体发生等压膨胀,当其体积为2L0S时,B开始移动,由盖一吕萨克定律得。ST。2L。S解得:T1=2T。;(4分)i.Ⅱ气体初态压强为:P2=P对Ⅱ由等温变化,应用玻意耳定律:P2LaS=P2L。S解得:P2=2PI气体此时压强:P1=P2=2P对I由理想气体状态方程:(其中P1=P0)P1LsP1×L0ST解得:T1=5T。(6分

写作Paragraph 1: Jatin looked up and saw the other boys rushing ahead Refusing togive up at this point, he jumped to his feet and ran as fast as he could. Hedashed across the finishing line and won the fourth prize. Thinking he would lether sister down, Jatin couldn t help sobbing. Just then he suddenly heard theannouncement from the broadcast that he won the thirdprize as the runner whocollided with Jatin was disqualified for breaking the rule. holding the shoes closeto his chest during the award ceremony Jatin felt overjoyed and relieved as heeventually won the shoes for his sister.(要点1 Jatin获奖)Paragraph 2Filled with pleasure, Jatin walked home quickly.(高分句型一) He could notwait to see his sister and share the good news. On his arrival, Jatin found Zahrawas waiting outside. Nervous and anxious, Zahra wondered whether herbrother had brought her what she was expectingZahra, see what i have gotfor you. Jatin said excitedly taking the prize out of his bag with his tremblinghands. The instant Zahra saw the shoes, her face lit up. So thrilled was shethat she threw herself at Jatin.(高分句型二)" Thank you!ltin." Tears of joywelled up in their eyes as the brother and the sister hugged tightly together (4 R2把奖品给妹妹)

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