英语周报 2018-2022 九年级 牛津 29答案

20.AC【解析】本题考查物体的平衡条件,目的是考查学生的推理能力。因A做匀速直线运动,OA绳的拉力大小F=mg,选项A正确;对B由物体的平衡条件有f+pmg=mgsn0,解得/= ma gsin B-mg,选项B错误;B和C整体受力平衡,C受到地面的静摩擦力大小为Fc0sb- pomI gcos,地面受到C的压力大小为(M+m2)g-Fsin=(M+m)g- am gsin 8,选项C正确、D错误

书面表达One possible versionDear johnI'm glad to tell you that my family will visit London during this summer holiday, when we can get togetherwith you there. Taking advantage of this opportunity, I'd appreciate it if you can tell me much about British history, such as the formation of the UK and its cultural tradition as well as its local customsAs I am not familiar with London, please recommend some tourist attractions for me. Ive heard that Lon-don has a lot of attractions, especially famous ancient architecture. If it is convenient for you, please be ourguide, giving a detailed description of the scenic spots at any timeLooking forward to your replyYoursLi hua

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