高中英语《module 1 life in the future 第5课时》学案 外研版必修4

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1、Period5:CulturalCorner学习目标：1.了解人们对未来世界的种种预测2.树立跨文化交际意识3.掌握重点句子的用法学习重点：了解人们对未来世界的种种预测学习难点：掌握重点句子的用法课前预习使用说明与学法指导：1.树立跨文化交际意识2.15分钟之内完成教材助读：GlassRecyclingGlasshastheleastvolatilepricingofallthepostconsumerrecyclingcommodities.Composedofsandandpotash;bottleglassismadefromreadilyavailableandinex

2、pensiverawmaterials.Tobecompetitive,recycledglassmustmaintainapricethatcompeteswiththeseabundantrawmaterials.Tradedasflint(clear),amber(brown),emerald(green)ormixedcolorbrokenglass.Thepricedependsonthecleanlinessandcoloroftherecycledproduct.Cleanflintcullet(anotherwordforbrokenglass)isusuall

3、ythemostdesirableformofrecycledglassscrap.Mixedcolorbrokenglasswithceramicsorstonesmixedinitistheleastdesirablegradeofculletbringingthelowestprice.MostRecyclerscolorsortandbreakorcrushandscreenbottlesbeforesellingtheirproduct.Modern,highproductionbottlemanufacturingrequiresverycleanandunifor

4、mfeedstock.Overthepastdecadetherehasbeenagrowthintheglassbenefactionsector.Theseareintermediateprocessorsthatreceiveglassfromrecyclingprogramsandrunitthroughaseriesofstepstoremoveanycontaminants(rocks,ceramics,metalcaps,etc.)andprovideauniformfeedstocktothebottlemanufacturers.Thesepreprocess

5、orprovideanexcellentmarketforrecyclingprogramsthatdonothavethevolumeorabilitytoproduceglassfordirectmilldelivery.Glassbeneficiationplantsusesophisticatedopticalsortingmachinestoseparatetheglassintothethreecolortypes.Theymayalsox-raytheglasstodetectanyrocksorceramicswhicharethenremoved.Magnet

6、sandeddycurrentseparatorsareusedtoremovedmagneticandnon-magneticmetalcontaminationfromcapsandlids.Theendproductisauniformlysizedloadofgroundglassthatisfreeofcontaminantsreadilyacceptablebybottlemanufacturers.Lowergradesofrecycledglassthataretoomixedorcontaminated,maybeusedinconcreteorinroadp

7、avingmaterialcalled"Glasshalt".Insomeareaswherethereisanoverabundanceoflowgradeglassitisusedtocoverovertherubbishinthelandfillinplaceofsand.Thisisnottrulyrecyclinganditishopedthatbettersortingtechnologywillsoonmakethismaterialusablefornewbottles.Gl