13.D解析:根据图示可知K4(CN)8在电极表面失电子生成KFe(CN)6,故图示电极为阳极其电极反应式为 K,Fe(CN)+K3一KFe(N)+K3,A项错误:当有1mol甲萘醌在阴极放电时,电路中转移4mol电子B项错误;工作时在电解池中阳离子应向阴极移动.C项错误:根据图示,该过程 NADPH被甲萘醌氧化,D项正确

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!

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