2018–2022高二RX广东专版英语周报答案

第一节【参考范文】Dear annieIm Li Hua. Hows everything going these days? I'd like to ask you to write an article for our schools English newspaperThe"Culture field "section is very popular among us students. And here are some relevant details about the articles we areeager for. Would you please write something about how Americans spend their holidays and festivals, which is interesting andinformative? 400 words would be fine. Could we have your article before June 10?I'm looking forward to your replySincerely yoursLi Hua

18【解析】由h一2可知球落回抛出点的速度大小是抛出初速度大小的一半,故选项A正确;小球落回抛出点时的速度为初速度的一半,由v2=2ah可知,则上升的加速度a1是下降加速度a:的4倍,故选项B错误;由mg+f=ma1,mg=ma,解得=3mg,故选项C错误;上升过程克服重力做功与下降过程重力做功相等,由于上升时间是下降时间的一半,由P=可知,上升过程克服重力做功的平均功率是下降过程重力做功平均功率的倍故选项D错误。

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