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Unit9Whenwasitinvented?SectionAPeriod2FourgreatinventionsinancientChina:Paper-making(造纸术)Compass(指南针)Printing(印刷术)Gunpowder(火药)A:Whenwasthetelephoneinvented?televisionin1927in1971Dialogue1:A:Whatisthis?Dialogue2:A:Whatisthis?Dialogue3:A:Whatisthis?Dialogue1:A:What’sthis?B:Itisavacuumcleaner.A:Doyouthinkitisthemosthelpfulinvention?B:YesIdo.Ithinkthemosthelpfulinventionisthevacuumcleaner.A:Whyisthat?B:Well,itcanhelpmecleanthefloorB:Well,Ifeeluncomfortableintheroomwithanair-conditioner.Groupwork(4:P70)