资源描述:
《大学英语四级模拟测试题(附答案).pdf》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、大学英语四级模拟测试题(附答案)四级模拟测试题1PartⅠWriting(30minutes)Directions:Forthispart,youareallowed30minutestowriteashortessayentitledThePopularityofGettingCertificatesonCampus.Youshouldwriteatleast150wordsfollowingtheoutlinegivenbelow.1.大学校园内各种证书的报考十分火热2.大学生考证的利弊3.考证面前,我的选择The
2、PopularityofGettingCertificatesonCampusPartⅡReadingComprehension(SkimmingandScanning)(15minutes)Directions:Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestionsonAnswerSheet1.Forquestions1-7,choosethebestanswerfromthefourchoicesmarkedA),B
3、),C)andD).Forquestions8-10,completethesentenceswiththeinformationgiveninthe1passage.MainEnergiesfortheBodyAbalanceddietisonethatprovidesanadequateintakeofenergyandnutrientsformaintenanceofthebodyandthereforegoodhealth.Adietcaneasilybeadequatefornormalbodilyfunct
4、ioning,yetmaynotbeabalanceddiet.CarbohydratesCarbohydratesarearapidsourceofenergy,theyarethebody’sfuel.Thebulkofabalanceddietshouldbemadefromcarbohydrates.Ifeateninanexcessofthedietaryrequirementscarbohydratesareeasilystoredasfatsinthecells,althoughcarbohydratei
5、sthefirstsourceofenergyinthebody.Anaverageadultrequiresabout12,000kJofenergyaday,mostofthisissuppliedbytherespirationofcarbohydratesinthecells.Carbohydratesareusedprincipallyasarespiratorysubstrates,i.e.tobeoxidizedtoreleaseenergyforactivetransport,macromolecule
6、synthesis,celldivisionandmusclecontraction.Carbohydratesaredigestedintheduodenumandileumandabsorbedasglucoseintocells.Sourcesofcarbohydratessuchasstarcharerice,potatoes,wheatandothercereals.Sugarsarealsocarbohydrates,2sourcesofsugarsarerefinedsugar-sucrose,which
7、isafoodsweetenerandpreservativeandfruitsugars-fructose.Ifthedietlackscarbohydratestoresoffataremobilizedandusedasanenergysource.ProteinsProteinisnotadirectsourceofenergyinthebody,itisusedprimarilyforgrowthandrepairofbodytissueswhileremaininganenergysourceasalast
8、resort.Proteinsfulfillawidevarietyofrolesinthebody.Theyarebrokendowninthestomachandintestinestoaminoacidswhicharethenabsorbed.Thebodycanonlyform8aminoacidstobuildprot