2021-2022英语周报答案

13.(1)BC(2分)(2)2.00(2分)(3)C(2分)【解析】(1)本题轻绳中的拉力可以由力传感器测出,不需要用天平測出砂和砂桶的总质量,也就不需要使砂和砂桶的总质量m远小于小车的质量M,A、D项错误;实验时需将长木板右端垫高,以平衡摩擦力,B项正确;实验时,小车应靠近打点计时器,先接通电源,再释放小车,需记录力传感器的示数,C项正确(2)相邻计数点间的时间间隔为T=5×0.02s0.1s,根据△x=a7,运用逐差法得9T7.10+9.13+11.09-5.12-3.09-1.10×10-2m/s2≈9×0.012.00m/s2(3)由牛顿第二定律得2F=(M+m。)a,则有aM+mF,F图象的斜率k=22M+m。小车的质量为M=k-m,故C项正确

参考范文:One possible versionDear Sir or MadamImLi Hua, a Senior Two student. I have read your advertisement for volunteers of the Sino-American YouthAmbassadorsonline Program. I'm writing to apply for participation in this activity.I consider myself a qualified candidate for the several reasons. First of all, a good command of English will make itpossible for me to communicate with fore gA members fluently. Besides, QIm)an outgoing person and have rich experiencein voluntary jobs, which can help get along well with American friends,in the'programI would like to present the long history and diverse culture of China to our friends and also learn more about Americaand its peopleI would appreciate it if you could consider my application and accept me as a member of the program. Lookingforward to your early reply.Yours sincerely,Li Hua

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