2021-2022高一英语周报31期答案

5.A解析:本题考查力的平衡。用传感器测出细线c受到的张力,对球1和球2作为整体分析,由三力共点平衡可以求出细线a对球1的拉力和两球的总重力,A项正确

第一节短文改错I missed the announcement!The 1,500-meter racewasabout to begin.And I also noticed mycompetitor lcompetitorslining upat the starting line.Before I realizcd was happening,whatheard the gun.My heart sank,but I couldn't throw awayso good A chance to compete!With my heartbeatildly,beatingI rushed to the starting line like crazyI had alreadybutbeen left far behind.However,I still ran as fast aspossibly.possibleSoon,I caught up with the other runners.When Iheard of people shouting and cheering,I ran evenfastfasterFinally,I ran past the only girl who was in front of myselfmeI was the first to cross the finishing line!

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