2022－2821英语周报高考第52期答案

24.解:(1)经过2t时间,B向右匀加速运动了L,B运动L的距离时A、B脱离,则亡=了(2分)【2021高考五月解密卷·理综卷参考答案(-)第4页(共6页)QG】解得脱离时向右运动的距离L=一L(1分)因此,分离时弹簧的形变量L=L-L=L0(2分)(2)A、B静止时kL。=2qE(1分)分离时刻AB之间没有力的作用,对于AkL-qE=ma(1分)由已知条件qE=方mg(1分)解得a=4g(1分)脱离时拉力有最大值F分离后F不再发生变化,对于小球B,根据牛顿第二定律,有Fax-gE=ma(2分)解得F叫=3mg(1分)

第二节One possible versionI asked him, "Why did you not tell my roommate that youare my brother?"He replied with a smile," If so, they willmake fun of you for having such a brother and you 'll surely feelembarrassed."Hearing his words I felt so touched that tears filledmy eyes. Then he took out some money from his pocket and put itin my hand, telling me to mind my health and not to worry abouthim. I pulled my brother into my arms and burst out crying. Thatyear, my brother was 20 years old and I was 23Several years later, when my brother got married, he wasasked who was the person he loved most. Without a secondthought, he answered, "My sister. " Then he continued, One day,my parents happened to be out and I became seriously ill. It wasmy sister who took me immediately to the hospital and finally Irecovered. From that day on, I was determined to do all that I couldfor my sister because I thought she was the dearest person to me.On such an occasion, I was moved to tears again by what he saidand took great pride in having such a nice brother

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