2022-2022英语周报第12期八年级答案

參考范文about a week later, Pomilla and Andrew got to meet her son'sSavion comilla and Andrew arrived at the metro station at theappointed time, anxiously waiting for Case to come. When Casearrived with a big smile, they felt very happy and excited. Casehugged Andrew warm-heartedly and reached out his right hand, sayingto him. Would you like to take it again?"without hesitation theboy took it and held it firmly. After talking for some time, Pomillatook out the badge and gave it back to Case. Many passengers tookictures of the sceneTaylor Pomilla was moved and expressed her thanks to Caseagain She asked Case how he could calm andrew down at that timeCase told her that he had a daughter with autism and that he hadreceived special training on how to deal with autistic children. Hepromised to visit them often to help Andrew grow up happily. As hewas talking, he took out a police badge that he made by hiimself andgave it to Andrew, who was more than happy to accept it. Ever sincethen they have been friends

21.AD小球从开始运动到落到轨道的过程做平抛运动,由题意可知,两次小球下落的高度相同,则由=√g可知两次小球运动的时间相同第一次以速度为w抛出后恰好落到c点时有x1=c1t= Rcos a Rsin a=53;第二次以速度抛出时小球落在d点时有x2=w2t=Rsa- Rsin a=R,所以动:w2=R:R=7:1,选项A正确;设两次平抛小555球落点竖直分速度为vy,根据平抛运动规律有3x=2×,由于h=Rsna Rcos a=x1,所以v=2a1,则两次小球落在c、d两点的速度之比为v功=√ :√ 可=75:√19,选项B错误根据加速度的定义a=③可知速度的变化量△v=g·△t,由于下落时间相同,所以小球从开始运动到落到轨道上,两次小球速度的变化量相同,选项7RC错误;第一次小球的平均速度大小为=5√2E第二次小球的平均速度大小为动=25t5)=2R,可得:=7:5,选项D正确

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