5.B【解析】图1中:X表示C3,Y表示丙酮酸,①表示光反应,②表示C3的还原,③表示有氧呼吸的第一阶段,④表示有氧呼吸的第二阶段,⑤表示二氧化碳的固定。图2中:a点只有呼吸作用,b点表示呼吸速率=光合速率,d点表示光饱和点。在图1的①~⑤过程中,产生ATP的反应过程有①③④,暗反应阶段不产生ATP,A错误;Y物质为丙酮酸,含有葡萄糖中的大部分能量,进入线粒体后逐步分解产生CO2,并在有氧呼吸的第三阶段产生大量的ATP,B正确;图2是在最适条件下测定,若提高外界环境温度,光合速率会下降,图2中b点将会右移、c点左下移,C错误;由于该植物所有细胞均进行呼吸作用,而只有部分细胞进行光合作用,故在b点所示条件下,该植物叶肉细胞光合速率大于呼吸速率,D错误
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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