----旅游081周振SILKSilkisthemostsuitablematerialstomakedress,becauseitislight,soft,durable,lustrousWhatismoresilkisresitanttoheatandacidandwashablewithcareChinastartedsilkproductionabout4500yearsago.Therearethebeautifulsilk,fantasticsatins,colorfulbrocade.TheSilkRouteYoucanfindpeoplefromwealthyfamiliesinsilkdresses.whichwerebelievedtobecommensuratewiththeirhighsocialpositionWHEREHOWYoumaybemoreinterestedinthesilkworms.Silkwormbreedingisdonebyfarmersinruralarea.Thesilkwormsareheavysleepers.Theywillkeepeatingthemulberrytreeleavesforacoupleofdays,andgotolongsleeplastingabout24hours。Whentheywakeupfromthelongsleep,theywillkeepeatingagain.Thesilkthreadfromthesevenoreightcocoonsformsintoone,makingitstrong.