2022英语周报初二44期答案

书面表达One possible version:Dear PeterI'm writing to invite you to attend a lecture about exercise and health in our schoolAs you know, there are many students who are overweight or short-sighted in our school. They devote all their energy to studying andignore exercise. As a result, they are not so strong and healthy as they should be. Besides, some girls choose to keep slim by controlling thdiet, which also affects their health. So we hope to promote some health knowledge through this lecture: The lecture, which is to be held in theschool hall next Friday afternoon, will last from 3: 00 pm to 5: 00 pm. I hope you can attend it and share something with us.ooking forward to receiving your early replyYours sincerely

34.(1)【答案】BDE(5分)【关键能力】本题通过简谐波的形成和传播,考查考生的理解能力和逻辑推理能力。【必备知识】本题考查波的形成和传播,需要考生根据波的传播方向判断各质点的振动方向,知道波速的影响因素,知道周期与波长的关系。【解题思路】波从波源向远处传播时,各质点的起振方向与波源的起振方向相同。根据波的传播方向与质点振动方向的关系可知,两波起振方向相同,故开始时甲、乙均向下抖动绳端,A错误。设各标记点间距为a,两列波在同一种介质中传播速度相同,图示时刻,甲波传播距离为5a,乙波传播距离为4a,甲波传播距离远,可知甲先抖动,乙开始抖动时刻,甲波前进距离为a,此时甲波源绳端位于平衡位置下方,B正确,C错误。甲、乙两波波长之比为3:2,均抖动了一个周期,由=A,得T=A,甲、乙抖绳所用的时间之比为3:2,D正确。抖绳过程,甲、乙带动绳端运动的总路程均等于4倍振幅,又两波振幅相等,故二者带动绳端运动的总路程相等,E正确。(2)【关键能力】本题通过光在圆柱形玻璃砖中的传播,考查考生的模型建构能力、信息加工能力及逻辑推理能力。【学科素养】本题考查的学科素养是科学思维中的模型建构和科学推理,需要考生根据光的折射定律推岀光在玻璃砖中传播的规律。(2)【关键能力】本题通过光在圆柱形玻璃砖中的传播,考查考生的模型建构能力、信息加工能力及逻辑推理能力。【学科素养】本题考查的学科素养是科学思维中的模型建构和科学推理,需要考生根据光的折射定律推出光在玻璃砖中传播的规律【解题思路】(i)某一光线传播的光路图如图所示,设入射角为i,折射角为r,人射点到PQ的距离为d由几何关系有sini=,sinr=(1分)由折射定律有n=(1分)sin r可得n=n,则CLy(1分)G)光在玻璃中传播的速度n=C(1分)光在玻璃中传播的时间t=-(1分)x77,则=5(1分)R由几何关系有i=2r,8=2(i-r)=2r(1分)cos 8= cos 2r= 2cos'r-I(1 3)在直角三角形BPQ中,有cosr=(1分)可得cos8=nn-1,则COs 6, L,-2Rco22-2F(1分)

以上就是2022英语周报初二44期答案，更多英语周报答案请关注本网站。