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1、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 TheP
2、opularityofGettingCertificatesonCampusPartⅡReadingComprehension(SkimmingandScanning)(15minutes) Directions:Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestionsonAnswerSheet1. Forquestions1-7,choosethebestanswerfromthefourchoicesma
3、rkedA),B),C)andD).Forquestions8-10,completethesentenceswiththeinformationgiveninthepassage. MainEnergiesfortheBody Abalanceddietisonethatprovidesanadequateintakeofenergyandnutrientsformaintenanceofthebodyandthereforegoodhealth.Adietcaneasilybeadequateforn
4、ormalbodilyfunctioning,yetmaynotbeabalanceddiet. Carbohydrates Carbohydratesarearapidsourceofenergy,theyarethebody’sfuel.Thebulkofabalanceddietshouldbemadefromcarbohydrates.Ifeateninanexcessofthedietaryrequirementscarbohydratesareeasilystoredasfatsinthece
5、lls,althoughcarbohydrateisthefirstsourceofenergyinthebody.Anaverageadultrequiresabout12,000kJofenergyaday,mostofthisissuppliedbytherespirationofcarbohydratesinthecells. Carbohydratesareusedprincipallyasarespiratorysubstrates,i.e.tobeoxidizedtoreleaseenergy
6、foractivetransport,macromoleculesynthesis,celldivisionandmusclecontraction.Carbohydratesaredigestedintheduodenumandileumandabsorbedasglucoseintocells.Sourcesofcarbohydratessuchasstarcharerice,potatoes,wheatandothercereals.Sugarsarealsocarbohydrates,sourceso
7、fsugarsarerefinedsugar-sucrose,whichisafoodsweetenerandpreservativeandfruitsugars-fructose.Ifthedietlackscarbohydratestoresoffataremobilizedandusedasanenergysource. Proteins Proteinisnotadirectsourceofenergyinthebody,itisusedprimarilyforgrowthandrepairofb
8、odytissueswhileremaininganenergysourceasalastresort.Proteinsfulfillawidevarietyofrolesinthebody.Theyarebrokendowninthestomachandintestinestoaminoacidswhicharethenabsorbed.Thebodycanonlyform8aminoacidst
