贵州百师联盟高三 答案

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第三节One possible version:Paragraph 1After reading the diary, the son was filled with tearsand began to reflect on the days when he used to sitogether with his father. His father would patiently answerthe same question all 23 times without feeling irritationwhile his father asked him the same question just fourtimes! The son thought to himself: If I attain old age, howwill my son look at me? Will he think of me as a burden?Will he shout at me because of my poor sight, poor hearingor poor understanding?

4.A【解析】当db边刚转入磁场时,ab部分切割磁感线,切割长度为a、b两点间的距离L,感应电动势大小E=B=B·t=bBa,由右手定则知ab边中电流方向为b→a,故a点的电势比b点的电势高,设线框abc每个边的电阻为R,a、b两点间的电势差为U1,2=,28故U=3BFaA项正确,