2017--2018学年人教版选修七Unit5TravellingabroadUsinglanguage课时作业

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1、Unit5TravellingabroadUsinglanguage课时作业i.完形填空Resealable（可密封的）plasticbags一sometimescalledbyabrandname,suchasZiploc®一arethoselittleclearplasticbagsyouusetokeepyoursandwichesandchipsfresh.Theyusuallyhavesomesortofsealingmechanism,likeaplasticzipper,whichallowsyoutosealthe

2、bagtokeep丄out.Keepingairawayfrom2allowsthemtostayfreshlonge匸Bacteriaandotherorganismsintheairwill3fooditemsovertimeifallowedtocomeinto4withthem.Sealedplasticbagskeeptheseorganisms_5_gettingtoyourfood・Resealableplasticbagscanbeusedformorethanjust6sandwiches,chipsandsna

3、ckstoschoolforlunch.They'realsousedtokeepleftovers_7—intherefrigerato匚Manypeoplealsousethemto8_foodinthefreezerforuseinthefuture・The9oftheresealableplasticbagstartedoutin1951atacompanynamedFlexigrip,Inc.Flexigrip]0aplasticzipperfrompatentswhichwasboughtfrom]]BorgeMads

4、en.Thesezipperswere12usedaspartsofbindersandbriefcases・Overtime,_[3_,plasticzipperbagsweredeveloped・Eventually，in1968,DowChemicalGOCompany」4tomarketitsZiplocbrandofresealableplasticbagstogrocerystores.Theyturnedouttobevery」5.Today,thesetypesofbagsare16inmanydifferents

5、izesandstyles,fromsnackandsandwichbagstocraftandfreezerbags.Youcanalsobuybagswithexpandablebottomsthat_17_ontheirown.Somebagsevenallowyoutofoodinthemicrowave!However,nowmanypeopletrytouse19plasticbecauseofitseffectontheenvironment.Somanufacturersofresealableplasticbag

6、shavetaken20tobecomemoreenvironmentallyfriendly.语篇解读：本文主要介绍了可密封塑料袋的用途及发展史。同时指出，为了减少污染，这种塑料袋的生产厂家也采取措施以使他们的产品更加环保。1.A.airB.waterC.dustD.fog解析：选A由第二段开头的"Keepingairaway"可知，此处指把空气阻挡在外面。2.A.plantsB.containersC・bagsD・foods解析：选D根据下文中的"Bacteriaandotherorganismsintheairwillfo

7、oditemsovertime^,可知，此处指让空气和食物隔离，以便食物保鲜的时间长些，故选foodso3•A.bringinB•takeout解析：选C空气中细菌和其他微生物会分解食物导致食物变质。breakdown意为“分解”OB.contact4.A.relationC・connectionD.contract解析：选B如果细菌和其他微生物与食物接触，食物将会很快变质。contact意为“接触”；relation意为"关系”；connection意为"连接”；contract意为"合同"。5.A.fromB.againstC

8、.throughD.beyond解析：选Akeep...from...为固定搭配，意为''阻止6.A.followingB.presentingC.supplyingD.transporting解析：选D下文中的"toschoolforlunch"