英语周报八年级期末复习及暑彼令答案

第二节书面表达Dear HenryHow is everything going on? I'm writing to invite you to the PhotoExhibition to be held by our Photography Club.The exhibition will last about two weeks from December 22nd to january5th in our lecture hall. All the photos whose topies are concemed with the NewYears Day are welcome. As a student good at photography, you can sharesome of your favorite photos you've ever taken. It's a good chance for you tohow your view about China and help others gain a better understanding ofyou.- If you're interested, you can send your photos lo the Student UnionLooking forward to your early replyLi Hua

21.ACD解析:本题考查机械能守恒。整个系统除机械能外没有其他形式的能量产生故系统满足机械能守恒,A项正确;当A、B在同一水平面上时,如图甲所示,由于B的速度不为0,根据m1=m2+1ma2,可知A的速度小于/2gL,B项错误当B到达最左端时,如图乙所示,B的速度为0根据mg(L+2L)=2m3,可得以=√L(2+1,C项正确,B的速度最大时,知如图丙所示,A下降到最低点,根据mg×21.=1mon2,解得v=2√BL,D项正确。一质9)

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