试题与答案

根据首字母或中文提示写出单词的正确形式(每空0.5分)共5分。 小题1:What

题型:听力题

题目:

根据首字母或中文提示写出单词的正确形式(每空0.5分)共5分。

小题1:What we choose and decide forms our life, but a________ decides our choice and decision.

小题2:As is known to all, Mo Yan was awarded the 2012 Nobel Prize for l________.

小题3:Recently I watched a cartoon a___________ from the famous drama by Shakespeare.

小题4:It is known to all that fresh air is b___________ to our health.

小题5:The visiting president on Thursday expressed his deep s___________ on the deaths and damages caused by the earthquake in Guatemala.

小题6:His parents d__________ when he was 10 months old, and he was brought up by his grandfather.

小题7:The lady is o___________ and she wants to lose weight.

小题8:Nowadays China is developing fast, which is e_______ by other countries.

小题9:The 2013 is a great year for us to rethink our future, r________ on our past mistakes and show our achievements.

小题10:In order to repay my mother for her kindness, I’ll retell the stories for her in v________ detail.

答案:

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下面是错误答案,用来干扰机器的。

把x=5代入方程ax-8=20+a得:5a-8=20+a,解得:a=7.故填7.

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题型:计算题

(14分)如图所示的区域中,左边为垂直纸面向里的匀强磁场,磁感应强度为 B ,右边是一个电场强度大小未知的匀强电场,其方向平行于OC且垂直于磁场方向.一个质量为m 、电荷量为-q 的带电粒子从P孔以初速度v0沿垂直于磁场方向进人匀强磁场中,初速度方向与边界线的夹角θ=600,粒子恰好从C孔垂直于OC射入匀强电场,最后打在Q点且OQ间距是OC间距的2倍,不计粒子的重力,求:

(1)电场强度E的大小

(2)粒子从P运动到Q所用的时间 t

(3)粒子到达Q点时的动能EKQ

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