外研版八年级上册《英语周报》第九期答案

外研版八年级上册《英语周报》第九期答案已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本网站。

【佳作展台Your Opinions WantedTo help us develop wide interests as well as live a more colourful andrelaxing campus life, our sheol inte ris to set up several new clubs ofexlra-curricular artivities. As everyone has their preference, we are hereto seek ull your opinions so that the new clubs will satisfy you most. Youare expecled to write down top three clubs you want an relative delails inthe fonn which you can download on our school website. The form shouldbesenttoxhstudentunion@163.combyAprillst.Everysuggestionicherisher and just make your voice heard【亮点梳理】亮点词汇: intends, sel up, preference, relativedetails, make your voice heard 3E亮点句式:原因状语从句( As everyone has their preference),定语从句( which you can download on our school website)等。

11.(1)2(1分)(2)-0.398(1分)0.903(1分)0.5(1分)(3)0.99%(1分)在误差允许的范围内,动量守【解析】(1)r=2s时相遇.发生碰撞(2)碰前A的动量PA=m42=0.199kg×(-2)=-0.398kg·m/s;碰前B的动量P=mBp=0.301kg×3m/s=0.903kg·m/s;碰后A、B-起的动量:A+月=(0.199(3)相对误差绝对值8|=P4+p.8+0.301kg)×1ms=0.500kg:m/s)C(2分)(2=0.99%,在误差的允许的范围内动量守恒

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