[成都一诊]成都市2020级高中毕业班第一次诊断性检测英语试题答案
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1.D【解析】冲量等于力与力作用时间的乘积,则地面对邓超的支持力的冲量不为零;邓超双脚起跳离开地面的过程中,地面对其支持力的作用点在力的方向上没有发生位移,即地面的支持力不做功,A项措误:邓超在起跳过程中,消耗了体内一部分化学能转化为机械能,所以机械能不守恒,B项错误;邓超起跳时地面对他的支持力和他对地面的压力为一对作用力与反作用力,由牛顿第三定律可知两者大小相等,C项错误;邓超在起跳过程中,地面对他的支持力大于自身的重力,加速度向上,处于超重状态,由动量定理可知合力的方向与动量变化量的方向相同,所以加速度的方向与其动量改变量的方向相同,D项正确。
书面表达【参考范文】Good morning,everyone!I'm very excited to voice my understanding of the officialmotto of the 2022 Winter Olympics-"Together for a sharedfuture".As the words indicate,we humans should stay inharmony in face of common challenges.And we need to worktogether to create a more inclusive world every individual canshare and enjoy.So,what can I do?I,for the first time,have felt howclosely I get involved in.I'll learn more about winter sportsand take up one.Of course,studying hard is the most urgenttask for me now.These will arm me with qualities for theworld we're longing for.Together,if everyone takes his role,we can contribute tothe common good of humans.Let's take action and do it.That's all.Thank you.