14.参考答案(1)20.0(1分)1.5(1分)(2)电流计内阻未知(2分(4)30(2分)3(2分)说明分析(1)电流计的最小有效分度值为1mA,经估读后示数为20.0mA。由欧姆定律得E=I(+Rg+R),则有E=30×10-3×(r+R8+17a),E=20×103×(r+R8+429),解两式得(2)在上面的计算中可以求出r+R。由于不知道电流计内阻Rn,所以无法求出电源内阻(4)结合题图丙所示的电路图,由电路规律得E=I(Rk+B)+I(R+RnR+r,整理1-最+++Ro由题图了的号一图像可计算截距为b一+士2-2A,率为上2-2Aa3120A-/g-1,解得r=39,R=30a

第三部分写作第一节【写作指导】本题要求写一篇报道,首先考生应把演讲比赛的目的、过程和反响写清楚;其次应合理布局,充实内容,仇化语言,提高得分档次。可用表达:要点1: In order to/ Aiming to arouse our interest in.Aimed at improving our spoken English等。k, 5. 2 thirty candidates participated in, everyone tried their best to/de the effort to .. impressed us with., splendid performance e4 E. 3 not only. . but also.., was highly thought of/a favoritewith.., more similar activities will be carried out/ arranged F【佳作展台】An English Speaking ContestAimed at enriching our campus life and improving our spokeni English, an English speaking contest was held in the hall last Sunday, inwhich thirty candidates participated. Every candidate was required to givea speech in 10 minutes. In the course of the contest, all competitors hadperfecl performance, with their pretty pronunciation and intonationimpressing the judges and audience present. No doubt, the whole processwas full of cheers and excitement. The contest was quite successful and afavorite with all us students. We hope more similar activities will becaRice ou【亮点梳理】亮点词汇: enrich, in the course of, prettypronunciation, intonation等。亮点结构:非谓语动词短语作状语( Aimed at enriching our campuslife and improving our spoken English),"介词+ which"引导的定语从句( in which thirty candidates participated),with复合结构( with their prettypronunciation and intonation impressing the judges and audiencei present)等

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