英语周报北师大432021-2022答案

28.(1)-49A△H1为正值,△H2和△H为负值,反应①活化能大于反应②的(2)①HO) P(CH,OH)P(H,). P(CO,②b总反应△H<0,升高温度时平衡向逆反应方向移动,甲醇的物质的量分数变小③33.3%5×103Pa,210℃9×103Pa,250℃

As a matter of fact, every day in every way that little elf was a nag(喋喋不休的人! Patrickwas working harder than ever and it was a drag! He was staying up nights, had never felt so weary,and was going to school with his eyes puffed and bleary. Finally, the last day of school arrived andthe elf was free to go. As for homework, there was no more, so he quietly and slyly slipped out theback doorPatrick got his As. His classmates were amazed His teachers smiled and were full of praiseAnd his parents? They wondered what had happened to Patrick. He was now the model kid. Hecleaned his room, did his chores, cheerful and never rude, like he had developed a whole newattitude. You see, in the end, Patrick still thought he'd made that tiny man do all his homeworkBut I'll share a secret just between you and me. It wasnt the elf. Patrick had done it himself

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