2022英语周报初一下39期答案

读后续写 One possible version)A bad guy just p/cked Kim up and took her away! yelled Julie. So shocked were Kims parents thatthey jumped up from the sofa and rushed over to Julie. Learning what had happened, they phoned thepolice without delay. The nextnt, they jumped into their car and drove off directed by Julie. By thenT had reached the alley, but the man was nowhere to be seen. "I must find Kim, "TJ said to himself. Heran along the alley to the end, where he spotted the man walking towards a white house. "Stop! Stop Withhese words, he charged at the guy fearlessly and held fast to Kim. However hard the guy tried to get rid ofTJ. TJ wouldnt give inAt that very moment, Kim s parents arrived. Help! Help! "TJ shouted. Immediately Kim's father tookoff toward the guy. Seeing this. he guy hurriedly let go of Kim and broke into a run. Kim's father dashedup, caught hold of him and pressed him to the ground. Kim ran crying into her mother s arms. Minutes later,the police arrived and arrested the guy. TJ breathed a sigh of relief and smiled happily. T]'s quick thinkingand bravery saved a little girl in the neighborhood from unimaginable consequences

于是:h=-B=3R(2分)(1)①5m/s(3分)②向下(2分)解析:由题意T=0.8s,波速v=个=5m/s,结合波的传播方向与质点振动方向的关系,可得x=2m处的质点图示时刻振动方向向下(2)解:①设OP之间的距离为d,光在空气中的传播速度为c,光在该液体中的传播速度为v则有:d=ct,d=v·2t(2分)液体的折射率n=(2分)所以n=2(2分)②如图所示,光线在P处恰好发生全反射时,入射角设为C,则有:siC=n=2,所以C=30(2分)

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