书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

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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