英语周报2021-2022 45期答案

第二节书面表达One possible versionDear peterI know you are interested in ancient Chinese cultureThere is a good news that an exhibition of ancient Chineseinventions will be held in our school next Monday. It willlast for five days. We can visit it at any time duringthe exhibitionThe show will display some great inventions in ancientChina. including the world-famous Four Great Inventionsthe compass, papermaking, gunpowder and printing. Theyhad significant effects on the development of society. Forexample, thanks to papermaking and printing, a great dealof ancient information has been kept in books. These greatancient inventions made tremendous contributions to theworld civilizationooking forward to your replyLi hu

5〖解析】物体b是电梯的一部分,相对地面静止卫星a是人造地球星且运行高度低于同步轨道,不能相对地府静止,故A项错误;物体b与卫星c的角速度相同.但物体b的运行半径小于卫星c的运行半径,由v=c·r知,物体h的线速度小于星c的线速度,故B项错误;I星c是同步卫星,而物体b是静止电梯的组成部分,故它们的周期相等,角速度相等。C项正确;物体b的角速度小予星a的角速溲,运行半径相同,由v=u2·r知,物体b的加速度小于星a的加速度,故D项错误。

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