unit1Reading课件
日期：2010-07-09 07:28
whentheylookedcloselyatthewhitelotus，ChinesescientistsstudiedhowspidersmakesilkModernscientistsareinterestedinthespider，tooAspidercanmakesilkthatismuchstrongerthanmostman-madematerialsAspider’ssilkdoesn’tbreakeasilyInsteadofbreaking，thescientistsbelievedthataveryflatleafwouldbebetteratstayingcleanHowever，itgetslongerBestofall，thespiderproducesthesilkwithouttheuseofdangerousorpoisonouschemicalsIfwecouldlearntousethetechnique，RevisionListeningtextonpage81Part1ScientistsoftenlookatnatureinordertofindnewideasInancienttimes，wemightbeabletousethestrongsilktomakethingslikeseatbeltsandwiresthatholdupbridgesPart2TherearemanyotherexamplesofhownewtechnologyhasbeendevelopedbylearningfromnatureAgroupofGermanscientistswantedtofindoutwhyleavesandflowersareabletostaysocleanTheydecidedtotakeacloserlookatthewhitelotus，aflowerthatisknownforitscleanleavesAtfirst，thescientistssawthattheleafwasinfactcoveredwithtinyhairsandneedlesTheneedlesandhairscollectthedustthatfallsontheleaf，
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