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语篇类型:记叙文主题语境:人与自我语境内客:作者回亿上学时一位老师对他的语助4,D推理判断题。根据第1段的内容可判断,作者家甲比较困难,因此他过着比较艰难的生活。5.B推理判断图,根据第1段中的I'd look onlongingly as the rich kids proudly sat down withtheir steaming plates of fried chicken知第3段中The next day.I proudly carried my tray of friedchicken and took my seat at the hot-lunch table推断,作者感到自豪是因为自己有资格和其他同学坐在一起了。6.C推理判断题。根据第4段中的My stomachinstantly dropped to the floor.Surely.I must bein trouble!Did she know】hadn't finished mymath sheet?Did she see me tease Billy on theplayground可推断,作者感到很担心。7.C细节理解则。根据最后一段中的Idkn1kwwhy Mrs Caruso took a shine to my family.May-be she also grew up in a family that struggled.Somehow.even with her quiet charity.she nevermade me feel ashamed可知,老师的善良给作者留下了深刘的印象。
34.(1)BCE解析:同一种介质对波长越短的光折射率越大,再根据=‘可知在同一种介质中,波长越短的光传播速度越小,A错误;“未见其人,先闻其声”是声波发生衍射的结果,B正确;水面上油膜的彩色条纹是由于光的干涉而形成的现象,C正确:做双缝干涉实验时,用红光替代紫光,光的波长增大,根据△=公可知相邻明条纹间距变大,D错误;火车鸣笛离开站台的过程中,站台听到的音调变低,这是多普勒效应,E正确(2)解:①由甲图知波的波长为λ=4m(1分)由乙图知波的周期为T=0.4s(1分)由乙图知,在=0时刻P质点沿y轴负向振动,根据同侧法可知波的传播方向为x轴负方向(1分)根据公式可得波的传播速度为。=会=10m/s(2分)②又经历0.7s,则1=0.7s=13T(1分)可知P质点振动到波峰,所以P质点的位移y=10cm=0.1m(2分)P质点运动的路程s=7A=7X10cm=0.7m(2分)