2022七年级英语周报新课标36期答案

34.解析:(1)根据题图乙可知,-025s时娳、b点正向上运动,再结合题叩可知,这波向右传播,A错试根据题可知,用期7“2波长4m,别速“r“2ms,B正确:质点c与质点e相距丰亼波长,它们的运动方向总相反、C正确:t=025s时,质点d从波谷位置向上运动、再经过5s=-、即在r=0.75s时,质点d处于平衡位置,并正在向正方向运动、D正确;各质点只在平衡位置上下倣简谐运动、并不随波迁移,E镨误(2)光线从S点沿肴OS方向射出时、传播时闻最短光在介质中传播的連度满足〃=“2分光在介质中传播的时间t得2(2-1)1分②先由个质射向空气,临界角满足如(-12分C~恰好发生全反射的光路如图所示,由正弦定理得nCin∠AO2分得:∠ASO=135°∠AOS=180°-∠ASO-C=15°1分透明半球体外表面发光区域在此戲面上形成的弧长为s°3602xr=2∠AOr=272∠AO答案:(1)BCD(2)-cm

第二节this time, Lewis was so distracted by the UFO.That's when the object entered the last cloud. From thereit was nothing but open sky. "When it appeared, my lifechanged, "Lewis says. "There against the richness of theblue sky was a silvery shape that seemed to have arms andlegs! It was so beautiful to look at. At the same time, ithad the appearance of metal. It looked like some kind ofship with a strange design. The best way I could describe itis that it looked like a silver tool in the design of thestickman children draw. It was huge, moving fasst anmade no noise.As it sailed overhead, some of the arms and legsould move up and down, giving the impression of beingalive!"He says. "It made a couple of rolls, reflecting thesun in every direction just beautiful! Slowly it landed onthe land. I imagined extraterrestrials would come out, butthat didn't happen. Then it began to rise and move fartherand farther away. As it started to fade away from myview, I found myself short of breath and with tearsrunning down my cheeks. It had that much of an effect onme. I began thinking maybe that's what an angel lookslike

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