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第二节：Then came the time for Alexander to sing with his group.He didn't want to sound tooloud.Instead,he thoroughly enjoyed singing with the others,trying his best to integrate his voicewith theirs.Finally,Mr.Robeson asked the kids about their performance experience,musiclessons and trainings.All Alexander could say was,"I just really enjoy singing,but I want to learnmore and practice more."He knew his answer was not perfect,but he was willing to do whateverit takes to become a better singer in the choir.Finally Mr.Robeson told Alexander that he made it,not Kevin.There must have beensome mistake."How did I make it,Mr.Robeson?"asked Alexander in disbelief."Well,you lovesinging.Although your voice isn't the best,with training it will improve.""But,what aboutKevin?"Alexander asked."Talent alone is not enough,"said Mr.Robeson."After all,we weren'tlooking for soloists."Alexander now understood that hard work and right attitude made adifference.He couldn't wait for the choir practice in the coming week.

6.有两根相同的轻弹簧α和b,劲度系数均为k,现将它们按图甲方式连接，下面挂质量均为m的两个“L小物体，此时两根轻弹簧的总伸长量为x,若将两个小物体按照图乙方式挂在两根轻弹簧上，则两根a轻弹簧的总伸长量为AB号b3x□BD.xB【答案】C甲乙【解析】根据胡克定律，图甲中x=mg+2m=4m,图乙中两根轻弹簧的总伸长量为x'-kkkk3mg 3x=,C正确，A、B、D错误。4