华普教育 2023全国名校高考分科综合卷(三)3生物试卷答案

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7.B【解析】由9x图像切线斜率的物理意义为该点电场强度可知，其电场强度先增大后减小，故A项错误；设粒子恰好到达x=0.2m处，其初速度是使粒子能沿x正方向持续运动下去的最小速度，由动能定理可得W=0-之m6,因只受电场力，有w=g一g),联立解得=人=6m/s,B项正确；由动能定n理可知C项错误；粒子在x=0.1m处加速度最大，速度不是最小，今后还会继续减速，D项错误。

书面表达【参考范文】Dear Tom,How are you?From your letter I get to know Su Bingtiancharms you.Yes,I couldn't agree more with you that he is anexcellent athlete worth admiring.And indeed,his perform-ance in Tokyo Olympics is extraordinary.As a matter of fact,besides Su Bingtian,there are manyother outstanding athletes in China too,among whom I admireQuan Hongchan most.She was born into a poor family.However,with her talent and more importantly,her persis-tent efforts,she changes her life.Her story really inspires meto pursue my own dream bravely.Su Bingtian and Quan Hongchan set a good example forus.We both should hold on to our dream,right?Best wishes！Yours,Li Hua