2019-2022英语周报七年级外研版第34期答案

书面表达Dear Sir or MadamI am Li Hus, an exchenge student from China. Wanting to get a library card in your library.(背景2分)1 am writing to ask for some relvant information.(目的3分)to begin with, could you please tell me what kind of books can beborrowed?(要点一6分) besides, I would be very interested to ksomething about borrowing system, including how long I can keep thebooks, how many books I can borrow once, and how much I should pay(要点二6分)L8 t but not least, I also wonder when and where I canmake it.(要点三6分)a中aThanks for your ime and I would appreciate it if you can give an earlreply.(表感谢+期回复2分)1量里的0+Yoour sincere.yLi H点国惊口人国文

答案】(15分)(1)ABE(5分)(1)√(4分)(Ⅱ)((6分)【命题意图】本题通过振动与波、光学问题考查学生的识记与理解能力。【解析】(1)由图可以直接读出该波的波长一定为8m,A正确;若波向右传播,则△y=元7=06s,波的周期T1=08s,波速Y=7=10m8,=09时,波向右传播的距离x==9m,点位于平衡位置:若波向左传播,则△=T=0.6s8,波的周期10T2=24s,波速2=7-30.9时,波向左传播的距离x=2!=3m,Q点位于平衡位置;所以B、E正确,C错误:波传播过程中,质点本身并不随波迁移,D错误。(2)(1)在A点折射时,由几何关系可知折射角∠QAC=30一则透明球体的折射、sin60°(2分)(2分)解得n=(Ⅱ)由几何关系可知AC=√3R(1分)()由几何关系可知AC=√3R…m(1分)(1分)在C点折射时,根据折射定律:n=sin 30…(1分)由几何关系可知CE=激光在介质中传播的速度y=C(1分)激光自A到E的传播时间t=AC、CE(1分)联立,解得(=(23+3)2(1分)点作中部的十出价如A《e

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