题目

阅读理解Thisis a common situation for beginner-level language learners—they want to readclassic(经典的)books, but what their language skills allow are usually little more thanchildren's books.OxfordUniversity Press tried to solve this problem back in 1988 by designing a seriesof graded English reading materials known as the Oxford Bookworms Library. Itnow has a collection of over 200 books—many of them simplified versions ofclassics—which fall into seven difficulty levels from starter levelto level six. However,there has always been a debate over whether shortened versions of clas如图所示，装置Ⅰ为甲烷燃料电池(电解质溶液为KOH溶液)，通过装置Ⅱ实现铁棒上镀铜。（1）a处应通入　　　(填“CH4”或“O2”)，b处电极上发生的电极反应式是　　　　　　　　　　　　　； （2）电镀结束后，装置Ⅰ中溶液的pH　　　(填“变大”“变小”或“不变”，下同)，装置Ⅱ中Cu2+的物质的量浓度　　　； （3）电镀结束后，装置Ⅰ溶液中的阴离子除了OH-以外还含有　　　(忽略水解)； （4）在此过程中若完全反应，装置Ⅱ中阴极质量变化12．8 g，则装置Ⅰ中理论上消耗甲烷　　　 L(标准状况下)。