2020－2022英语周报高考第11qi答案

20.BDPQ两点处弹簧弹力的大小相等,则由胡克定律可知P点的压缩量等于Q点的伸长量,由几何关系知PQ=dm3-3d,则小球位于P点时弹簧的压缩量为x=PQ=3对P点的小球由力的平衡条件可知mg=k,.解得k,选项A错误;当小球运动到P点时,假设小球甲的速度为v,此时物体乙的速度为零,又小球、物体和弹簧组成的系统机械能守恒则由机械能守恒定律得切g(=-0-mm53=m,解得=√÷m,选项B正确;小球由P到Q的过程弹簧的弹性势能先减小后增大,则小球甲和物体乙的机械能之和先增大后减小,选项D正确;由于小球在P和Q点处,物体乙的速度都为零,则物体乙重力的瞬时功率先增大后减小,选项C错误

【语篇导读】本文是一篇记叙文。文章讲述了作者曾经隐瞒了自己驾照考试失败的事情,后来意识到失败和不完美是每个人成长的必经之路24.∧【解析】推理判断题。根据第一段中 I had gotten aperfect score for my written permit cxam, but gettingbebind the wheel was a different story, nf A. Matthew笔试成绩很好,但是开车开得不好,由此推测,他是一个学车很慢的人。故选A25.Δ【解析】细节理解题。根据第二段中 I had receivedan auto fail since my pause was indeed a pause and nota real stop.可知, Matthew在驾照考试过程中由于自己的失误导致了考试失败.所以教练让他靠边停车。故选A。26,D【解析】细节理解题。根据第二段中 I wasn t upsethat I was leaving without a license. but I was scaredthat everyone would know that I had failed.可知Matthew不会因为没通过考试难过,但是却害怕别人知道自己失败了,故 Matthew是怕在同学面前丢人故选D27.B【解析】推理判断題。根据最后一段 Now I realizefailure and imperfection are two things everyone has toexperience. without which one couldn't make a trueman.可知. Matthew意识到,失败和不完美是每个人都必须经历的事情.没有经历它们,就不会真正的成长。故选B。

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