书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

3D【解析】规定磁感应强度方向垂直纸面向里为正,依据楞次定律,在0~1s内,穿过线圈向里的磁通量增大,则线圈中产生逆时针方向感应电流,那么流过电阻R的电流方向为b→R→a,A错误;由题图乙可知,在2~3s内,穿过金属圆环的磁通量在增大,B错误;在1~2s内磁通量减小由楞次定律可知,产生的感应电流方向为aR→b,在2~3s内磁通量增大,且磁感应强度方向相反,由楞次定律可知,产生的电流方向为a→R→b,C错误;当t=2s时,根据法拉第电磁感应定律E△BSπr2Bo,不计金属圆环的电阻,因此Ua=E=rr2Bn,D正确。故选D。

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