实验室制取乙烯的反应原理为CH3CH2OH
CH2=CH2↑+H2O，反应时，常因温度过高而使乙醇和浓H2SO4反应生成少量的SO2，有人设计下列实验确认上述混合气体中有乙烯和二氧化硫。
试回答下列问题：
(1)图中①、②、③、④装置盛放的试剂分别是（填标号）。
①____,②____,③____,④____。
A．品红溶液 B．NaOH溶液 C．浓硫酸 D．酸性高锰酸钾溶液
(2)能说明SO2存在的实验现象是____________。
(3)使用装置②的目的是____________。
(4)使用装置③的目的是____________。
(5)验证乙烯存在的实验现象是____________。
(1)①A ②B ③A ④D
(2)装置①中品红溶液褪色
(3)除去SO2气体以免干扰乙烯的检验
(4)检验SO2是否除尽
(5)装置③中的品红溶液不褪色，装置④中的酸性高锰酸钾溶液褪色
When I was about 13, my father would take me on short outings on Saturdays. On the way home, Dad stopped at the Dairy Queen for lO-cent ice creams. I couldn't it, but I could pray from the we started heading home to that comer where we would either go straight for the ice cream or and go home empty-handed. That corner either mouth-watering excitement or .On one special day, we were heading home, and again I was praying for the sound of his offer ,It ,”Would you like an ice cream today?” That sounds great, Dad!” But then he said,” How would you like to today?” Twenty cents! My mind reeled(震惊),I could afford it,I got a weekly allowance of 25cents ,plus some for odd jobs. But it wsa my money ,ice cream wasn’t a good use of it ,In a fit of ,I said ,”well ,in that case,I guess I’ll ,”My father just said,” Okay, Son,” But sa we headed home ,I realized how wrong I was and begged him to .But he just said,” That’s okay ,we don’t really need one.” I felt for my selfishness and ungratefully see. He didn’t mind, or act disappointed. I that generosity(慷慨) goes two ways and gratefulness sometimes costs more than” thank you”. On that day gratefulness would have cost 20 cents and it would have been the ice cream I’d ever had. I’ll tell you one more thing. We another trip the next week. As we the center. I said,” Dad, would you like an ice cream today? My treat.”
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