【導(dǎo)讀】Whenwasitinvented?n.電;電能/,ilek'tris?ti/. n.高興;愉快/'ple??(r)/. n.(=zip)拉鏈;拉鎖/'zip?(r)/. n.先鋒;先/,pai?'ni?/,/,pai?'nir/. v.替代;說(shuō)到/'men?n/. inancientChina?Doyouknow?beforetheputer.A:Ithink…wasinventedbefore…B:Well,Ithink…wasinventedafter…beforetheTVset.A:Ithink…wasinventedbefore…B:Well,Ithink…wasinventedafter…theputer.A:Ithink…wasinventedbefore…B:Well,Ithink…wasinventedafter…chartbelow.usedfor?cream.outfor_________.informationin2b.B:They’reusedfor...withlightsusedfor?They’reusedfor. dark.for?coldice-cream.for?oftheshoes.thinkofaninvention?Roy:Mypleasure!Iknow!Thezipper!Paul:Thezipper?Isitreally. everywhere!Roy:Ofcourse!