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1、Harvardresearchershavecreatedatough,low-cost,阅读理解答案 Harvardresearchershavecreatedatough,low-cost,biodegradable(可生物降解的)materialinspiredbyinsects’hardoutershells.Thematerial’sinventorssayithasanumberofpossibleusesandsomedaycouldprovideamoreenvironmentallyfrien
2、dlyalternativetoplastic.Thematerial,madefromshrimp(‘虾)shellsandproteinsproducedfromsilk,iscalled“shrilk.”Itisthin,clear,flexibleandstrong. Amajorbenefitofthematerialisitsbiodegradability.Plastic’stoughnessandflexibilityrepresentedarevolutioninmaterialsscienc
3、eduringthe1950sand‘60s.Decadeslater,however,plastic’sverydurability(耐用性)israisingquestionsabouthowappropriateitisforone-timeproductssuchasplasticbags,orshort-livedconsumergoods,usedinthehomeforafewyearsandthencastintoalandfillwheretheywilldegradeforcenturies.
4、Whatisthepointofmakingsomethingthatlasts1,000years? Shrilknotonlywilldegradeinalandfill,butitsbasiccomponentsareusedasfertilizer(肥料),andsowillenrichthesoil. Shrilkhasgreatpotential,theinventorssaid.Materialsfromwhichitismadeareplentifulinnature,foundinevery
5、thingrangingfromshrimpshells,insectbodiestolivingplants.Thatmakesshrilklowcost,anditsmassproductionpossibleshoulditbeusedforproductsdemandingalotofmaterial. Workonshrilkiscontinuinginthelab.Theinventorssaidthematerialbecomesflexiblewhenwet,sothey’reexploring
6、waystouseitinwetenvironments.They’realsodevelopingsimplerproductionprocesses,whichcouldbeusedfornon-medicalproducts,likeforcomputercasesandotherproductsinsidethehome.They’reevenexploringcombiningitwithothermaterials,likecarbonfibers,togiveitnewproperties. 66
7、.ParagraphIofthepassageismainlyaboutshritk’s_____. A.remarkabledesignB.interestingname C.majorfeaturesD.basicelements 67.Whathasbecomeaconcernaboutplastic? A.Usingitproperly.B.Producingitcheaply. C.Developingitspropertiesquickly.,D.Evaluatingitscontribut
8、ionsfairly. 68.Accordingtotheinventors,shrilkhasgreatpotentialpartlybecause_____. A.itcanhelpplasticdegradeB.itcanbefoundinlivingthings C.itsmassproductionhasbeenrealizedD.itsrawmateri
