英语周报第二期高二2022-2022答案

第一节短文改错(共10小题;每小题1分,满分10分)I believe that eyeing is my favourites sport for severalfavouritereasons. First of all, it is a fast and healthy way to get fromone place to others. In the meantime, when ride a bike,anotherI don't pollute the environment. Instead of it is often calledgreen travel". Then cycling is a great way to keep myenergy and state of minds just like any other sport, thacan help lift my spirit. More important, what is significantfor me is the sense of freedom when comparing to other formsof movement. In conclusion, cycling gives me a chance AIt.

11BC【解析】在D点对小球进行受力分析,如图所示。则FN= kL sin e=kx=0.5mg,则F(=pFN=0.25mg,则摩擦力做功为Ws=-Fth=-0.25mgh,A错误;从C点到D点过程,有mgh-0.25mgh-W=0,再返回C点,根据动能定理有-0.25mgh-mgh+W弹=02my2,解得v=√gh,B正确;若仅把小球的质量变成2mn,从C到D根据动能定理得2mxh-0.25mxhW角=0-+×2mv2,则v′=√kh,C正确;若仅把小球的质量变成2m,则小球向下运动到速度为零时,绳做功变大,且无法求出,故小球下落最终位置无法求出,D错误。故选BC。◆C

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