2022掌上周报英语七上答案

第三部分写作第一节【写作指导】审题本题属于应用文写作中的邀请信立意写作时使用第一人称和第二人称,时态以一般将来时为主首段陈述写邮件的目的;中间段介绍讲座的写作时间、地点和内容,并说明邀请理由;最后思路几谋篇一段表达期待布局冂注意:考生也可以灵活安排每段的写作内容,但不可以遗漏要点推荐根据构思好的提纲确定写作可能用到的表达,表达to: invite, attend a lecture, waste food, raiseone' s awareness of等【佳作展台】Dear MikeI am writing to invite you to attend a lecture about Clear Your plateThe lecture is to be held in our school hall at 2: 30 pm nextThursday. It will be given by our headmaster, who will tell us the reasonsfor launching the campaign. Besides, he will talk about various activitiesto be carried out which are aimed at raising students awarenessof savingI think the lecture can help us have a better understanding of the campaignand form the habit of saving.i do hope you can join me. Please write back soonYours.Li hua亮点梳理】本文开篇点明写邮件的目的,接着详细介绍了此次讲座的相关情况,最后表达期望,内容完整,语勺流畅,同时使用了亮点词汇和句子。亮点词汇:atnd, launch, carry out, be aimed at, raIse one'sawareness of, have a better understanding of =o亮点句式:①非限制性定语从句 who will tell us the reasons forlaunching the campaign②强调句 i do hope you can join me

11.AC【解析】本题考查牛顿第二定律,目的是考查学生的分析综合能力。由牛顿第二定律可知传送带不动或顺时针转动时,工件始终受沿斜面向上的摩擦力作用,工件在传送带上运动的加速度大小a=gsin37°ucos37°=2m/s2,有v2-w2=2aL,解得=3m/s,选项A正确、选项B错误;若传送带以速度v3.5m/s逆时针匀速转动,当工件的速度小于传送带时,摩擦力方向向下,a1=gsin37 gcos37°=10m/s2,由v2-w2=2ax,解得x=0.5625m,则当工件在传送带上运动的速度等于传送带的速度3.5m/s后,a=2m/s32,由v2-2=2a(L-x1),得v=32m/s,选项C正确;若传送带以速度v=7m/s逆时针匀速转动,当工件的速度小于传送带时,摩擦力方向向下,a1=gsin37° ucos37=10m/s2,由v2-w2=2ax2,得x2=2.4m>L,则传送带受到的摩擦力一直向下,由v2-12=2aL得v=√4m/s,选项D错误。

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