七年级英语教育周报第28答案

第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在"尊敬和爱戴的原因",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】The most beloved and respected person around me is my teacher, Ms LiThough she has been teaching English for twenty years, she is still passionateabout teaching. She is kind and considerate towards us just like our dear motherWe all respect her because she always tries new ways to make her classes livelyand interesting. Hardworking and knowledgeable, she is one of the best teachersin our school. When we have a problem, we will turn to her for help. She alwaystalks to us patiently and helps us to find a solution. In our eyes, she is not onlyour teacher, but also our best friend. Those are why she deserves our respect【亮点词句】亮点词汇: beloved, respected, be passionate about, be consideratetowards, turn to sb. for help, in one's eyes亮点句式:Why引导的表语从句( why she deserves our respect)

8.(1)0(1分)12V(1分)2V(1分)(2)15300(2分)1.8(2分)(3)12.5V(2分)1.25(2分)【解析】(1)步骤a中.电流计G的示数为0时,电路中A、B两点电势相等.即A和B两点的电势差UAB=0;A和C两点的电势差等于电压表的示数即UAc=12V;A和D两点的电势差UA=-12V。(2)利用步骤a中的测量数据可以求得电压表的内阻为.A12R12=1530,电流表的内阻为0.4R30.6RRn-28.2=1.8。0.4(3)由闭合电路欧姆定律可得2E=2UAc Ⅰ·2r,即2E=24V 0.8A·r,同理2E=U1c I′·2r,解得E=12.5V,r=1.25。

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