题目

假定你是李华，英国朋友Lucy发来邮件询问你在疫情期间的学习情况。请给她回封邮件，内容包括：1）感谢关心； 2）学习情况； 3）你的感受。注意：写作词数约为80字。Dear Lucy，……Yours,LiHua 答案：Dear Lucy, Thanks for your concern. I'd like to tell you something about my studies during the pandemic. Since the start of the pandemic, our learning has moved online. We usually have online classes on weekdays. We can ask questions, have discussions and even work with other students. At first, the transition to online learning was difficult. Now I find I am learning as much as when I attended 在测定匀变速直线运动的加速度的实验中，计时器所用电源的频率为50Hz.随小车一起做匀加速直线运动的纸带上记录下0、1、2、3、4、5等一些计数点，每相邻的两计数点间，都有四个计时点未画出，如图7所示.用米尺量出0到1、2、3、4、5的距离分别是2.78cm、6.77cm、11.96cm、18.36cm、25.97cm.如果让你选择三个相邻的计数点讨论该运动的话，则你所选的是______________，计算经过计数点5时的速度大小为______________.