①点燃酒精灯，给试管加热②熄灭酒精灯③检查装置的气密性④将高锰酸钾装入试管里，试管口放一小团棉花，用带导管的胶塞塞紧，并将它固定在铁架台上⑤用排水法收集氧气⑥将导管从水中取出，正确的操作顺序是（    ）

完形填空

     George selected his food in Value Mart carefully. He estimated he had180cents today.He was pleased he had got good2for his money again.

      At the exit，the freezing wind3him of his gloves.He was sure he was wearing them whenentering the4.He made a search of his pockets.Then he thought theymust have been5somewhere in the store.George had bought the blackgloves for $35 ten years ago.They were leather，softand durable.Until then，hehad worn cheaper man­made material that never lasted long.His6to buythe gloves turned out to be good，whicheven7his position on the bus，aspoorer passengers stared at him8.

      George re­entered the store.He followed the same9he had walked before，10at the bread counter，to the dairy section，to the shelf where salt and sugar wereplaced.It did not take long to be11that the gloves were notthere.His12grew heavier.“People have changed，” he13.“Years ago，if somebody14something lost，they would give it back.”

      Ye the did not give up.This time he focused on the gloves on other shoppers’ 15.Suddenly he16a ladynearby wearing a black pair of gloves.He said，“Hi！” But when the surprised lady returnedhis17，hiseyes dropped to the floor，forthe fingers of her gloves were too small for him.

     Without gloves，hehad to18his hands into his sleeves.Back home，George was19.He could notdo without gloves.George decided to buy another leather pair.But before that，he stepped into Value Mart again tosee if by any20his gloves had been returned to the lost and foundoffice.The girl looked into her drawer and took out a pair of men’s leathergloves.“Are they？”

“Yes! Mine ！”George shouted with joy.

为稳定农村土地承包关系，近年来，国家开展了农村土地确权登记颁证，向农民“确实权、颁铁证”。2016年11月，中共中央、国务院发布《关于完善农村土地所有权承包权经营权分置办法的意见》。《意见》指出，现阶段深化农村土地制度改革，顺应农民保留土地承包权、流转土地经营权的意愿，将土地承包经营权分为承包权和经营权，实行三权分置并行，着力推进农业现代化。这是继家庭联产承包责任制后农村改革又一重大制度创新，对今后一段时期农村土地制度改革将产生深远影响。

结合材料，探宄回答下列问题：