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!

12.D【解析】在多晶铜电极区,二氧化碳转化为甲烷,碳元素化合价降低得电子,发生了还原反应,所以多晶铜为阴极,接电源的负极,即b为电源的负极,A错误:阳极氢氧根离子放电生成O2,同时H与从阴极区迁移到阳极区的HCO反应还要生成CO2,B错误;升高温度会降低二氧化碳气体的溶解度,不利于二氧化碳的甲烷化,C错误;阴极发生反应:9CO2+8e+6H2O==CH4+8HCO3,D正确

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