2022 英语周报 高三 20答案

Most of us senior 3 students may feel discouragedbecause A the great pressure of study. To relieve根据下文中的" the great pressure of study”可知,此处应用ecause of because是连词,后接句子them, I think the following tip will be helpful此处指代上文提到ip"建议"是可数名词,下文的" the great pressure表明作者提了不止一条建of study",故应用it议,故用tipsFirstly, shift our focus. Focus too much on ourFocusing此处为动名词短语作主语grades will make us more nervous. So we'd better ta.had better do sth,是固定用法,表示”最好做某事think about the progress we had made, which helpslave此处表示到现在为止已经完成的动作,应用现在完成时build our self-confidence. Secondly, take someexercise.It's known to all if all work and no playthatIt是形式主语,后面的从句是真正的主语,从句句意和成分完整,故用thatmakes Jack a dull boy We should get into a habit oftheget into the habit of"养成……的习惯"是固定用法doing sports as it will help us build our body up andfeel relaxing all over. Finally, sleep well. A goodrelaxe此处表示感到放松, relaxed"放松的", relaxing"使人放松的”nights sleep can make us recharge our batteries andstart over easyeasily此处修饰动词,表示”容易地”,故用副词 easily

17.(14分)解(1)在x≤一L区域内,粒子在电场力作用下做类平抛运动由运动学规律有:2L-L=vt(1分)L=2(1分)=√v v(1分)联立以上各式解得:四3(1分)设粒子在Q点的速度与x轴正方向的夹角为0则:cos0=(1分)得:0=30°,故速度方向与x轴正方向成30°角(1分)(2)在一L≤x<0区域内,粒子做匀速圆周运动的轨迹如答图2,设圆心为O1,轨道半径为R1,R1sin=(1分)故:R1=L由牛顿第二定律有:qB1=mR1(1分)×、解得:B1=2vvo(2分)3)在圆形区域内,粒子做匀速圆周运动的轨迹如答图3,设圆心为O2,轨道半径为R2由题意可知圆形区域的答图2半径为:r=2180°-60°因:∠O0O2==60(1分)且:∠OOO2=90°-8=60故:△OOO2是等边三角形,R2=r=(1分)60由牛顿第二定律有:qoB=mR2(1分)RR2解得:B14√3mv(1分)答图339L(其它合理解法,参照给分)

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