英语周报2017-2018高三答案

写作Dear denny,m lia reporter from our school English newspaper. I' m writing to ask whether youcan meet me for an interview at three this friday afternoon in your office.【高分句型一】(点明书倍目的-采访时间和地点mproving reading ability is very important to us students.【高分句型二】 Some of us havegreat trouble reading english materials, especially famous original works. you know a goodpart of our exam consists of reading and this is where we easily lose marks. We need someadvice on how to improve our reading ability. I'd appreciate it if you could spare some timeand give us some advice.(采访内容)ooking forward to your early reply..(期盼回复Yoursua

11.B)〖解析〗设粒子的速度为υ,它在MN左侧区域燃场中的运动轨迹为圆弧PS,圆弧对应的心为(,半径为R,如图所示,则gB=mpg,且()P平行于MN;粒子进入MN右侧区域酸场中的运动轨迹为圆弧SQ,圆弧对应的园心为(入,半径为R2则(.=i)且2Q平行于MN,连接OS、SO)2,则)、S、O在同一条直线上,设∠P(O)1S=∠QO)2Sa,由几何关系可得OP=(Q=Rn,O1S=R1,5(2=R2,R1sina= Ro sin U1,R2sina=尺si、联立解得RRi. sIn t∧项错误,顼正确;粒子在MN左侧区域磁场中的运动时间为=2x=2x2x=m2,粒子在MN石侧区城磁场中的运动时间为:=27=2xB=0B,联立解得〃sin心项错误,1)项甙确9

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