1ACD【解析】当粒子在电场中加速时有≈1当粒子速度较大时,粒子在磁场Ⅰ中直接从a点经半圆周到达b点,此时粒子运动的轨道半径为r1=2R,由qvB1=m一,解得U=2kBiR3。若粒子进入磁场Ⅱ次,粒子运动的轨迹如图所示,设进入磁场I的轨迹半径为r2,则由几何关系有2R=r3+√r+R2,解得R,则=37°,粒子在Ⅱ中的运动轨迹半径为r=R,由a0B1=nuB=m,解得U=9kBIR2kB, B:R或,A、C、D正确,B错误。故32选ACDB

第三节书面表达wersionDear Sir or MadamMy name is Li Hua. As an exchange student fromChina, I am studying in a local school. I am reallydelighted to learn that a volunteer for your Chinese culturallic exhibition is required and I'm confident that I amtruly fit for thestart with, my advantage first lies in the fact that IChina and used to beand quite familiar with Chinese relics. Further-more, being an outgoing and optimistic boy, I am good atcommunicating with others and introducing Chinese cultureto the world is always my honor and my pleasure. Finallythere is no problem with my spoken English, as I havelived here for almost a year and I have no difficulty commu-dicating with others in EnglishI would really appreciate it if you can offer me thechance to be a volunteer in your museum. I am looking forward to your early reply.Li Hua

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