2022英语周报第六期，七年级答案

14.(1)见解析(2分)(2)C(2分)a(2分)(3)0.38(0.360.40均可)(2分)【解析】本题考查电学实验中的实物连线及数据处理等(1)电路连线如图甲所示。甲(2)由电路图知滑动变阻器采用分压接法,为使调节过程中电压变化尽可能均匀,则应选用的滑动变阻器为最大阻值较小的R1,故选C;为保护电路,闭合开关前,滑动变阻器的滑动触头应放在a端(3)设小灯泡两端电压为U,流过的电流为,根据闭合电路欧姆定律有E=U+I(R+r)。在小灯泡的I-U图像中画出电路的-U图线,交点为(1.49V,0.255A),如图乙所示,此时小灯泡的实际功率为P=U≈0.255×1.49W≈0.38W。奉/A0.3001.02.030U/v乙【关键点拨】依据电路图进行实物连线时,应注意以下几点(1)连接电表应注意量程选择正确,正负接线柱不要接错:(2)各导线都应接在接线柱上,不应在导线中间出现交叉;(3)对于滑动变阻器的连接,要搞清楚接入电路的是哪一部分,在接线时要特别注意不能将线接到滑动触头上;(4)连线方式一般先从电源正极开始,到开关,再到滑动变阻器等,按顺序将电路中要串联的元件依次串联起来,然后将要并联的元件再并联到电路中去。

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

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