2022 英语周报 高一 课标GDY 46答案

25【解析】本题考查带电粒子在匀强磁场中的运动目的是考查学生的分析综合能方。空音动】(1坐埃在两板间运动轨迹如图甲所示,由儿何知识可知不时一一年…0-2y2+(2y=2(2分)92分、图用一,四路解得n=l(2分)尘埃做圆周运动由洛伦兹力提供向心力,则有6=m(2分)83”家加出合济宝养痉音,解得B=2(2分)得金知端得个,m一的(2)由几何关系可知,当尘埃沿M板射人时,恰好能到达容器P圆数,0=那甲,8mx2形磁场区域的最小半径Rm满足五(.列2老,08=8m,=9套常蜜励节量由,变军图lypl+(代8)00(1)Roin其中d=(2分)解得Rm=(1分)所以圆形磁场区域的圆心坐标为(,-31).(1分)实的主学查学的目,高关游如本【】(3)由几何关系可知,粒子在磁场做圆周运动的半径等于圆形磁场区域的半径,粒子在磁场中运动由洛伦力提供间石为则样真的升三声南回刻,gun B,=分)答等合N解得B2=5m(1分)尘埃沿轴射人圆形磁场区域时,由几何关累可知告也动人面解得si6-0.6,即=37“7(1分)阳里读,中轴多中高本Rn+ R sin=l(1分)尘埃在圆形磁场中运动轨迹所对应圆弧的圆心角为下下180°-(90°-0)=127(1分)(,307,其中T=2mEm:(1分)代资,杂的立点11127rl解得2880(2分)次染,同写食瓷学中不世

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)

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