18(幂⑨C什么命题人考查带电粒子在电磁组合场中的运动,旨在考查考生的分析综合能力。么考带正电粒子在电场中做加速运动,由动能定理得=2m2-2m,代入数据解得t=3×10m/s,A项错误;粒子离开电场R区域后,以速度t从M点沿MO方向进入磁场,在磁场中做匀速圆周运动,洛伦兹力提供向心力,则有cB=mR,代入数据解得R=3m,B项错误;粒子的轨迹如图所示,由几何知识得tan=h=2,解得6=30°,故粒子的偏转角度为B=2=60°,C项正确;由几何知识得sm=r1anB=3m,即粒子打在荧光屏上N点上方3m处,D项错

第四部分At seven o'clock on last Sunday, my friends and Istart off from my home with food and water for a moun-startedtain clim bing It took them about an hour to got to the footof the mountain by bike. At eight we began to climb themountain, talk and laughing. One and a half hour later,talkinghoursve reached the top of the mountain, where we sanggether, told stories but even played some funny gamesAfter that we put that we had taken on a piece of clothand had a big lunch, Then at a bout two o' clock in the afternoon we began to go back home, tired but happily.appy71.删除on考查介词。 last Sunday可以直接作时间状语,前面不需要加介词72. start→ started考查动词时态。根据时间状语lastSunday可知,谓语动词应用一般过去时态73.them→-us考查代词。结合上下文语境可知,人称代词them使用错误,应改为us74.got→get考查非谓语动词,不定式符号to之后接动詞原形75. talk--talking考查非谓语动词。此处为非谓语动词短语在句中作伴随状语。76.hour- hours考查名词复数, one and a half hours为常用表达,意为“一个半小时”。77. but-and考查并列连词,根据语境可知,转折连詞but使用错误,应改为and。78.第二个that→what考查宾语从句,what引导宾语从句,并在从句中作宾语79.bg前添加a考查冠词。名词 lunch之前有形容词修饰,且在句中表示泛指,故之前添加a。80. happily-- happy考查形容词。此处用形容词 tired和hap py作状语。

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