第一节参考范文:Last Friday evening witnessed a breathtaking English Singing Contest in our schoolstadium, where 15 singers competed for"The Best English Singer of the YearThe singers, who had stood out from the first round of selection, gave energeticperformances on stage. Throughout the contest, the atmosphere in the stadium was extremelyexciting, with many students singing along to nearly every song. At last, the award went toZhang Xin from Class 1 Grade 1Everyone agreed that the contest enriched our campus life as well as kindling ourpassion for English learning

20.CD解析:最终两棒将以相同的速度匀速运动,A错:10时,1=BB=ma,(a=2842,B错解得误:3m1-mpo=2mm,-BLt=m-37m1,q=1t,解得q=如m的,C正确:由动量及能量关系有3m-mo=mn:zm2+2m(30)2=2m2+2Q,可得Q=2m2,D正确。m3

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