(大学专业英语2)Lesson2 Nutrition
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第一章测试1【单选题】(2分)Oneofthemostimportant______alecturerneedsistheabilitytomakethelecturesinteresting ().A.componentsB.benefitsC.characteristicsD.factors2【单选题】(2分)Thestudent______consistedofmarchingthroughthecampusanddeliveringacomplainttoth ecollegeprincipal().A.rebellionB.claimC.allianceD.resignation3【单选题】(2分)Indifficultsituationsit'simportanttobe______ratherthanaggressive().A.attractiveB.conservativeC.submissiveD.assertive4【单选题】(2分)Myviewsareverydifferentfrommyparents'andouropinionsoften_____().A.clashB.slashC.combatD.crash5【单选题】(2分)Whendiscussingphilosophy,it'simportantthatyou_____yourterms().A.refineB.mineC.confineD.define6【单选题】(2分)Whenyouareinvolvedinafightofanykind,it'sveryhelpfultohave_____().A.enemiesB.membersC.groupsD.allies7【单选题】(2分)ThegovernorofCalifornia_____thethestairsinordertotalktothestudents().A.dissentedB.descendedC.declinedD.defended8【单选题】(2分) Thesedaysmoststudentsaimtostudysubjectsthatwillmakethem_____().A.affableB.agreeableC.employableD.satisfying9【单选题】(2分)TheprofessoraskedifIhadthe_____gradesforthecourse().A.demandedB.requiredC.requestD.supposed10【单选题】(2分)Duringthe1960s,EuropeanandAmericancollegecampuseswerenotoriousfortheir_____st udents().A.obedientB.rebelliousC.criticalD.cynical第二章测试1【单选题】(2分)It'svery_____forababytobeleftaloneforalongtime().A.distrustfulB.distressedC.distressfulD.stressful2【单选题】(2分)_____isthetimeinourliveswhenweareatourmostdependent().A.InfancyB.AdolescenceC.FancyD.Youth3【单选题】(2分)Thetoddler's_____ofhiselderbrothermadeeveryonelaugh().A.limitationB.imitationC.invitationD.invention4【单选题】(2分)Motherstendtobevery_____wheretheirchildrenareconcerned().A.flagrantB.dominantC.awareD.observant5【单选题】(2分) Wouldyouagreethatinmanyculturesboysaretaughtnottoshowtheir_____().A.senseB.sensationC.sensitivityD.sensibility6【单选题】(2分)Thehotelguestbecame_____annoyedwhenstafftoldhimsmokingwasnotpermittedinthelo bby().A.definitelyB.distinctivelyC.D.distinctly7【单选题】(2分)Whenthe_____occurred,manypeopleweresofrightenedthatforseveralhoursafterwardsth eycouldnotsayaword().A.expeditionB.explorationC.exclusionD.explosion8【单选题】(2分)Althoughhebeganlifeasawealthyyoungman,his_____spendingonyachtsandracehorsess oonreducedhisfortunetonothing().A.excessiveB.inadequateC.D.expressive9【单选题】(2分)Thepsychologistthoughtthechild's_____wascausedbythefactthathewasjealousofhisyou ngerbrother().A.misfortuneB.behaviourC.actionD.behaviourism10【单选题】(2分)Ifelthuge_____whenIrealizedIhadfoodonmychinfortheentiremealandnoonetoldme().A.embarrassmentB.harassmentC.disappointmentD.annoyance第三章测试1【单选题】(2分)I'malwaysamusedbyhowsadand____footballfansseemaftertheteamtheysupporthaslosta match().A.mournfulB.stressfulC.helpfulD.distrustful2【单选题】(2分)ThedoctortoldHarrythatshewasn'tsurprisedhewascomplainingof_____whenhewasrunni ng15kilometresaday().A.expeditionB.C.expansionD.extension3【单选题】(2分) Shewasterrifiedthatshewouldnotbeabletotakepartinthegameduetotheinjurytoherankle,b ut_____,itgotbetterintime().A.distinctlyB.deliberatelyC.thankfullyD.directly4【单选题】(2分)Itrippedoverabatthathad_____beenleftonthecricketpitchandsprainedmyankle().A.accidentallyB.C.incidentallyD.apparently5【单选题】(2分)Our15-year-oldsonissogoodatfootballthathishopeofbecominga_____footballplayerislike lytoberealized().A.rotationalB.educationalC.professionalD.amateur6【单选题】(2分)TheTVhadbrokendownsowelistenedtothefootball_____ontheradioinstead().A.expositionB.C.discourseD.comment7【单选题】(2分) Throwingaballintoanetfromadistanceofeightmetresrequiresagreatdealof_____().A.accurateB.precisionC.revisionD.decision8【单选题】(2分)_____arrivedverysuddenly,beforetheplayerswereabletoremovealltheequipmentfromthe field().A.DarknessB.C.StillnessD.Silence9【单选题】(2分)Footballchantsarean_____ofhowclubsshowsupportfortheirteam().A.illustrationB.demonstrationC.ministrationD.frustration10【单选题】(2分)Aftertwohoursofdelaycausedbyrain,thecrowdcheeredatthe_____ofthetennismatch().A.consumptionB.resumptionC.presumptionD.assumption第四章测试1【单选题】(2分)Criminalscanaccessyouraccountbyusinga(n)__identity().A.validB.fakeC.deceitfulD.false2【单选题】(2分) Inhisstatementhecontradictedhimselfseveraltimeswhichmadeabad_____onthepolicedet ectives().A.feelingB.influenceC.depressionD.impression3【单选题】(2分)Alotofpersonal____onourcomputerscanbeaccessedbyhackers().A.staffB.matterC.stiffD.stuff4【单选题】(2分)Incourt,theevidencewasshowntobe__false().A.whollyB.largelyC.partiallyD.entirely5【单选题】(2分)Thereportoncomputercrime_____severalmeasureswecantaketopreventit().A.mentorsB.mentionsC.mendsD.manages6【单选题】(2分)Itcanlooklikea(n)____email,butinfactit'sascam().A.oddB.regularC.circularD.casual7【单选题】(2分)Thebankgotalotofbad_____afteritlostpersonaldataontheweb().A.attentionB.publicityC.publicD.popularity8【单选题】(2分)Whenhesawhisoldfriend,he_____,“Iwascertainyou’dcome!”().A.barkedB.claimedC.exclaimedD.roared9【单选题】(2分) Aftertheheavyrainseveraldistrictsclosetotheriverwere_____().A.mergedB.emergedC.inversedD.submerged10【单选题】(2分) TwentyyearsinthewesthadturnedBobintoa(n)_____criminal().A.habitualB.frequentC.mutualD.habitat第五章测试1【单选题】(2分)Peoplewhoare_____withgolffinditveryhardtounderstandwhyitissopopular().A.acquaintedB.unfamiliarC.familiarD.popular2【单选题】(2分)Wewereworriedaboutourson's_____atweekendsandsenthimtosummercampinthehopet hathewouldgetinterestedinoutdooractivities().A.inabilityB.incompetenceC.inactivityD.sensitivity3【单选题】(2分)Wewantedtoentertainourguestbutknewitwouldbe_____totakehimtoanartgalleryorthethe atreashewasblind().A.meaningfulB.delightfulC.carelessD.pointless4【单选题】(2分)Mysisterdislikesgoingonholidaybecauseshehasa(n)_____fearofnewplaces().A.irresistibleB.irregularC.irrationalD.impulsive5【单选题】(2分)"Youwerevery_____torefusetocomeclimbingwithme,"myboyfriendcomplained().A.courageousB.riskyC.consciousD.unadventurous6【单选题】(2分)Idecidedtotakeupahobbythatwascompletely_____withmywork().A.connectedB.contactedC.confrontedD.collective7【单选题】(2分)Afterworkinghardalldayitwas_____thatallhewantedtodowastocollapseinfrontoftheTVfort herestoftheevening().A.doubtfulB.questionableC.unbelievableD.understandable8【单选题】(2分)Readingasahobbyhasmany_____benefits,forexample,thefactthatyouoftenmakenewfrie ndsthroughbookgroups().A.maximumB.indictC.incorrectD.indirect9【单选题】(2分)Nothingcanbeatthe_____ofaFIFAWorldCupfinal.().A.assessmentB.amendmentC.excitementD.employment10【单选题】(2分)Wewerealldisappointedbythe_____offormercaptainfromtheOlympicteam().A.survivalB.removalC.memorialD.arrival第六章测试1【单选题】(2分)TheSilkRoadisanancienttrade_____betweenEuropeandChina().A.routeB.wayC.avenueD.road2【单选题】(2分)Scientistsarestudyinga_____ofstarsthatmayhavehabitableplanets().A.schoolB.flockC.crowdD.cluster3【单选题】(2分)Itisnotalwayspossibletopredictwhatproblemsyouwill_____whenyoustartyourresearch().A.encourageB.endangerC.encounterD.establish4【单选题】(2分)Couldyouplease_____thedeadlineformyessay()?A.extentB.exertC.extendD.expand5【单选题】(2分)Depressioncan_____thebody’sdefenses().A.lowerB.dampenC.StrengthenD.lessen6【单选题】(2分) Anticipatingbadluckissaidtobeawayof_____fate().A.testingB.temptingC.tacklingD.taunting7【单选题】(2分)Weestimatethe_____ofobservinganeclipseat50percent.().A.presumptionB.accuracyC.capabilityD.probability8【单选题】(2分)Ihavealwayshadaninsatiable_____aboutastronomy().A.knowledgeB.patienceC.curiosityD.insight9【单选题】(2分)Thefirstmeetingofthestudents’committeewaspleasant,but_____meetingsbecamequitest ressful().A.antecedentB.subsequentC.consequentD.previous10【单选题】(2分)Themoontakesjustover27daysto_____aroundtheearth().A.removeB.rotateC.revolveD.reflect第七章测试1【单选题】(2分)Shelookedvery_____andshowednothingofthesufferingshehadendured().A.gloomyB.emotionalC.criticalD.tranquil2【单选题】(2分)Thegeneralsdecidedthattheplantoinvadefromthesouthwas_____astheycouldnotgeteno ughsoldiersthereintime().A.deadlyB.complicatedC.impracticalD.destructive3【单选题】(2分)Whenhereturnedfromthewar,hischaracterhadchangedandhebecamevery_____,shoutin gangrilyathisfamilyfornogoodreason().A.moodyB.unreliableC.startledD.curious4【单选题】(2分)Itwasagreedthatthesoldiershaddonewellandshowed_____courageduringthelongbattle()?A.vigorousB.curiousC.considerableD.tolerant5【单选题】(2分)Themayorlookednervousand_____whengivinghisspeech().A.flexibleB.agitatedC.unfortunateD.renowned6【单选题】(2分)Themenlookedvery_____whenthepilottoldthemthatitwasadangerousmissionandtheymi ghtnotsurvive().A.sympatheticB.soberC.keenD.enthusiastic7【单选题】(2分)Someofthemenweremore_____thanothersabouttheirchancesofsurvival().A.generousB.alertC.optimisticD.enthusiastic8【单选题】(2分)Karenhasbeenvery_____sinceshefoundoutthatshecan’tgotomedicalschool().A.remarkableB.absurdC.impracticalD.moody9【单选题】(2分)Theworkers_____theoldbuildinginordertomakeroomforanewlibrary().A.decoratedB.demolishedC.polishedD.constructed10【单选题】(2分)Thedovehasbeenaworldwide_____ofpeaceformanycenturies().A.symbolB.signpostC.signD.signal第八章测试1【单选题】(2分)Thegroupleader,whohadworkedwiththelocalpeopleforatleastfiveyears,wasverydedicate d_____herwork().A.whichB.forC.atD.to2【单选题】(2分)It'swell-knownthatworkingasavolunteercanlead______manyinterestingjobs().A.towardsB.forC.intoD.to3【单选题】(2分)I'mnotatallsureI'msuited_____thiskindofwork().A.atB.intoC.toD.4【单选题】(2分)WhenIhearthenameRedCross,Iassociateit_____helpingpeopleandhumanitarianwork().A.atB.withC.forD.in5【单选题】(2分)Theuniversitycanteenisabletocater_____about300students().A.atB.withC.toD.6【单选题】(2分)Thereisahugeshortage__sciencegraduatesintheUK().A.withB.atC.ofD.in7【单选题】(2分)Employerscanfinditdifficulttodiscriminate_____jobcandidateswhohavetherightskillsandt hosewhopretendtohavetherightskills().A.withB.inC.forD.between8【单选题】(2分)Thecompanydirectorsdecidedto_____agymonthefirstflooroftheofficeblocksothatemploy eescouldexerciseduringthelunchhour().A.equipB.Establish`C.installD.erect9【单选题】(2分)Hefeltsuch_____atthethoughtofthejobinterviewthathishandsbegantoshake().A.dreadB.excitementC.nervousD.awe10【单选题】(2分)Theare_____waysstudentscanaddtotheirskillsandexperiencewhileatuniversity().A.numerousB.abundantC.numerateD.numerical。
UNIT 2 Food and NutritionUNIT 2 Food and Nutrition1. Teaching Objectives:1.Ss can read about calorie postings in fast-food restaurants2.Ss can read about food and health in ancient documents and modern science3.Ss can use words and expressions to talk about calorie counting4.Ss can use words and expressions to talk and write about health benefits of food2. Time Allotment:1st Period: Pre-reading Activities (Warm-up; Group discussion; Background information introduction)2nd Period: Words & expressions3rd Period: While-reading Activities (Global-reading: understanding TextⅠas a whole+detailed reading)4th Period: Detailed reading+exercises5th Period&6th Period: Text II and related exercises7th Period& 8th Period: listening exercise3. Teaching Procedures:3.1 Pre-reading ActivitiesStep 1 Warm-up questions:1) Is McDonald’s or Starbucks your favorite fast-food restaurant? Why or why not?2)How can kids cope with the trouble of obesity?Step 2 Research1. Food SecurityFood security is the most basic problem of p eople’s livelihood, and it has become the focus of the global concern. The food safety incidents that have occurred in China over the past few years are still fresh in people’s minds: melamine-tainted milk powder, gutter oil and dyed steamed buns. Incidents like these are a source of constant public concern. Please go to interview at least 10 consumers in such fast-food restaurants as McDonald’s and Starbucks to see whether they are worried about food security there and ask them why or why not?2.Fresh Fruits and Vegetables and the Frozen CounterpartsSurf the Internet to find the real truth about the nutrition of fresh fruits and vegetables and their frozen counterparts.3.2 While-reading ActivitiesStep 1. Global reading: understanding Text I as a wholeAsk the students to read the text first and then finish the comprehension questions and text structure on page 27-28.Step 2. Detailed reading: learning TextⅠin detailStudents are asked to read the passage carefully again and discuss the difficult sentences and sentence structures.Purpose: Further understand the text (Train further reading ability)to find out some difficult sentences and details of the text.Method:Reading the text together; Using task-based language teaching method, reading approach, communicative approach, grammar-translation approach and total physical response method.Difficult sentences:1.Given widespread public concern over obesity in recent years, and the rise of a hugeweight-loss industry that encourages people to be careful about how much they eat, … (Para. 1) 本句中的given 是介词,意为“考虑到”,其后接两个宾语:widespread public concern 和the rise of a huge weight-loss industry, 而that 引导的则是一个定语从句,修饰先行词industry, 关系代词that 在定语从句中做主语。
Unit 2 Healthy eating话题词汇1.appetite n.食欲;胃口2.delicious adj.美味的;可口的3.fresh adj.新鲜的4.digest v.消化;领会5.nutrition n.营养;滋养6.recipe n.食谱;烹饪法7.taste v.品尝;n.味道8.be high/low in含……高/低9.build up one’s body增强某人的体质10.keep a balanced diet保持均衡的饮食话题佳作目前,食品安全问题引起了人们的广泛关注。
一些生产厂商为了降低成本追求利润,缺乏足够的安全措施,致使一些劣质或有害食品流入市场,对人们的健康产生了极大的危害。
请你就此事给一家英文报刊写封信,谈谈个人看法并呼吁整个社会关注此事。
注意:词数100左右。
参考词汇:利润profit;安全措施safety measures佳作欣赏Dear Sir,I’m writing t o talk about the problems of food safety nowadays.To reduce the cost and make more profits,some food companies don’t take necessary safety measures to guarantee the food quality.As a result,moreand more lowquality food flows into the market,doing a lot of harm to consumers’ health.In my opinion,food is essential to human beings.We can not live without proper food.If no notice were taken of food safety,the health of the whole nation would suffer.So I call on the whole society to take action and put anend to the lowquality food.Only in this way can we live a healthier life.Yours truly,Li Hua 名师点睛本文结构清晰,层次分明。
as‧sume / əˈsjuːm $ əˈsuːm / verb [ transitive ]1 to think that something is true, although you do not have definite proof SYN presume 假定,设想assume (that)I think we can safely assume (= it is almost certain ) that interest rates will go up again soon.let us/let’s assume (that) (= used when thinking about a possible event or situation and its possible results )Let us assume for a moment that we could indeed fire her. Should we?When it got to midnight and Paul was still not back, I began to assume the worst (= think that the worst possible thing had happened ) .2 assume control/responsibility etc formal to start to have control, responsibility etc or to start in a particular position or job承担,接受: Whoever they appoint will assume responsibility for all financial matters. He assumed power in a bloody coup in 1990.Jim Paton will assume the role of managing director.3 assume a manner/air/expression etc formal to behave in a way that does not show how you really feel, especially in order to seem more confident, happy etc than you are SYN put on 装出,佯作:Andy assumed an air of indifference whenever her name was mentioned.→ASSUMINGas‧sum‧ing / əˈsjuːmɪŋ $ əˈsuː- / ( also asˈsuming that ) conjunction 假定used when talking about an event or situation that might happen, and what you will do if it happens :Assuming that you get a place at university, how are you going to finance your studies?eccentric 2 noun [ countable ]someone who behaves in a way that is different from what is usual or socially accepted :I was regarded as something of an eccentric.ec‧cen‧tric 1 / ɪkˈsentrɪk / adjectivebehaving in a way that is unusual and different from most people :His eccentric behaviour lost him his job.Aunt Nessy was always a bit eccentric.THESAURUSstrange unusual or surprising, especially in a way that is difficult to understand, or that is a little frightening : What’s that strange noise downstairs? | That’s strange –I’m sur e I left my keys on the table. | a strange old manfunny/odd especially spoken a little strange and making you feel slightly surprised or worried : There’s a funny smell in the kitchen. | It’s odd that you can’t remember him at all.curious especially written strange, especially in an interesting way. Curious is a little more formal than strange : a curious fact | There’s something rather curious about small-town America. | She remembered curious little details. mysterious strange – used about something that people know little about and are unable to explain or understand : He had disappeared in mysterious circumstances. | There were reports of mysterious lights in the sky.eccentric strange in a way that seems slightly crazy and amusing – used about people and their behaviour : He lived completely alone and had some slightly eccentric habits. | an eccentric old ladypeculiar s lightly strange, and different from what you would normally expect –used especially when this is either amusing or worrying : She sometimes wears rather peculiar clothes. | He had a peculiar expression on his face.VERY STRA NGEweird very strange or very different from what you are used to : I had a weird dream last night. | It’s a weird and wonderful place.bizarre extremely strange and different from what is usually considered normal : It was a bizarre situation. | Mark’s behaviour was really bizarre. surreal extremely strange and unconnected with real life or normal experiences, like something out of a dream : His paintings are full of surreal images. | There is something surreal about the climate change talks in Bali. | The plant’s flowers were so big that they seemed almost surrealuncanny very strange – used especially about someone having an unusual ability to do something, or looking surprisingly similar to someone : She had an uncanny knack (= ability ) of putting her finger right on a problem. | Alice had an uncanny resemblance to Josie. | his uncanny ability to pick racing winners hook 1 / hʊk / noun [ countable ]1 a curved piece of metal or plastic that you use for hanging things on →peg :Tom hung his coat on the hook behind the door.2 a curved piece of thin metal with a sharp point for catching fish3 let/get somebody off the hook to allow someone or help someone to get out of a difficult situation :I wasn’t prepared to let her off the hook that easily.4 by hook or by crook if you are going to do something by hook or by crook, you are determined to do it, whatever methods you have to use 不择手段,千方百计地:The police are going to get these guys, by hook or by crook.hook 2 verb [ transitive ]1 to catch a fish with a hook :I hooked a 20-pound salmon last week.2 [ always + adverb/preposition ] to fasten or hang something onto something elsehook something onto/to somethingJust hook the bucket onto the rope and lower it down.o‧blige / əˈblaɪdʒ/ verb formal1 [ transitive usually passive ] if you are obliged to do something, you have to do it because the situation, the law, a duty etc makes it necessaryoblige somebody to do somethingThe minister was obliged to report at least once every six months. Circumstances had obliged him to sell the business.feel obliged to do something (= feel that you have a duty to do something ) Many parents feel obliged to pay for at least part of the wedding.►Do not use oblige when you are talking about a person making someone do something they do not want to do. Use force or make : No one can force (NOT oblige) you to stay in a job that you hate.R EGISTERIn everyday English, people usually say that you have to do something rather than are obliged to do something :He had to sell the business.2 [ intransitive and transitive ] to do something that someone has asked you to do答应(某人的)请求:Would you oblige me by taking this letter to the Director?happy/glad/ready etc to obligeIf you need a ride home, I’d be happy to oblige.3 I’d be obliged if spoken formal used to make a polite request 多谢(请别人帮忙时的客气话):I’d be obliged if you’d treat this matter as strictly confidential.4 (I’m) much obliged (to you) spoken old-fashioned used to thank someone very politely 非常感谢con‧ve‧ni‧ent / kənˈviːniənt / adjective1 useful to you because it saves you time, or does not spoil your plans or cause you problems OPP inconvenient :Mail-order catalogs are a convenient way to shop.My secretary will call you to arrange a convenient time to meet.convenient forIs three o'clock convenient for you?convenient to do somethingIt is simple and convenient to use.R EGISTERIn everyday English, people usually say a good time/day etc rather than a convenient time/day etc:Is this a good time for you to talk?2 close and easy to reach OPP inconvenient :The bus stop around the corner is probably the most convenient.convenient for British English convenient to American English : restaurants convenient for shops and theatres→INCONVENIENTcon‧ve‧ni‧ence / kənˈviːniəns / noun1 [ uncountable ] the quality of being suitable or useful for a particular purpose, especially by making something easier or saving you time :Ready meals sell well because of their convenience.the convenience of doing somethingMost of us like the convenience of using credit cards to buy things.for convenienceFor convenience, the German translation is printed below.2 [ uncountable ] what is easiest and best for a particular personat sb’s convenience (= at a time that is best and easiest for someone ) These meals can be prepared in advance, and served at your convenience.for sb’s convenienceFor your convenience, the bank is open until 7 p.m.Services should be run to suit the convenience of the customer, not the staff.3 [ countable ] something that is useful because it saves you time or means that you have less work to do :The supermarket offers a bag-packing service, as a convenience to customers.a hotel with all the modern conveniences4 at your earliest convenience formal as soon as possible – used in letters :We should be grateful if you would reply at your earliest convenience.5 [ countable usually plural ] ( also public convenience ) formal a public toilet6 a marriage of convenience a marriage that has been agreed for a particular purpose, not because the two people love each other :In the past most royal marriages were marriages of convenience, arranged for political reasons.。
Unit2 NutritionWhat we eat as well as how much we eat determine our nutrition status to an important extent,and influenced by a diversity of external and internal factors.The person who wants to find the answer to the question" what should I eat for good nutrition?“,might easily become lost in the maze of informational corridors,confused by the wealth of technical information provided by scientists or mislead by simplistic answers provided by those with products to sell.Somewhere in between is some reasonable,commonsense information that we can use to guide us our quest for sound nutrition knowledge.To begin,we need to learn some definitions of commonly used nutrition terms and find out what sorts of guidelines are available to help us measure the quality of our diets and to develop healthful eating patterns.NUTRITION AND FOOD:DEFINITIONSThe word nutrition is often paired with the word food because the two go together. They are interdependent,but not interchangeable.Food might be defined as any edible substance that provides nourishment when consumed. It is made up of many natural ingredients all chemicals that have different functions such as providing odor,flavor,color,and nourishment. The ingredients that give us nourishment are called nutrients.These nutrients are categorized as fats,proteins carbohydrates (sugars and starches),minerals,vitamins,and water. They are called essential nutrients because we cannot get along without them. We need them for energy,for building and maintaining body tissue;and for regulating body processes ,these are the three essential functions of foods in the body.Nutrition might be defined as the process whereby we obtain the essential nutrients and use them to make many other substances our bodies need,this process would include eating and digesting food and absorbing and using,or metabolizing,the nutrients it contains.We can obtain all of the essential nutrients from food. However,it is possible to obtain nourishment without eating and digesting food-if,for example,the nutrients are injected directly to our veins as in intravenous feeding.Thus,it is the nutrients that are essential and the food that normally provides them. Since food is vital,we need to know the nutritive content of foods,whichones are the best sources of the various nutrients and how to combine them into a healthful diet.The term good nutrition implies that we are obtaining from our food all of the essential nutrients in the amounts needed to keep our bodies functioning and to maintain optimum health. A very simplified definition of good nutrition might be" eating the right foods in the right amounts.“The work of nutrition scientists involves finding the answer to questions about nutrients-their function in the body,the amount of each that we need,what happenings when we receive too much or too little and about food and diet-what foods we should eat and in what amount.Yet nutrition science in its broadest sense has many more facets:the influence of sensory factors of flavor,color,and texture of food on eating behavior;the psychological,cultural,emotional,and social aspects of food intake;and even the economics of food availability and consumer behavior in the purchase of food.THE NUTRIENTSTo date,nutrition scientists have identified some 40 to 45 substances as essential nutrients. But the list is growing as new nutrients continue to be identified;the history of nutrition science contains fascinating stories about the ways food substances have been identified as essential nutrients. In some instances,medical researchers seeking the cause of a particular disease found that problem was due to a single substance,and that when this substance was added to the diet,the symptoms of the disease disappeared. A number of vitamins were discovered in this way.Nutrients might be divided into two general categories based on the amount that we need. These are the macronutrients (carbohydrates,fats,proteins,and water),which we need in relatively large amounts and the micronutrients (mineral elements and vitamins),which we need in relatively small amounts. All of the nutrients except for mineral elements and water are classified as organic chemicals because they contain the element carbon. Mineral elements and water are inorganic chemicals because they do not contain carbon.The vitamins are divided into two general categorizes based on their solubility in either water or fat .the fat-soluble vitamins are vitamins A,D,E,and K;the water-soluble vitamins include vitamins C (ascorbic acid),niacin,thiamin,riboflavin,flacon (also called folic acid)antithetic acid,pyridoxine,vitamin B12 and biotin.The mineral elements are divided into two categories based on the quantity of them that we need. Macroelements are those needed in relatively large amounts,while microelements are those needed in very small amounts,some example ofmacroelements are sodium,calcium,and phosphorus. Some example of microelements is iron,iodine,manganese,zinc,and fluorine.RECOMMENDED DIETARY ALLOWANCESOnce a nutrient is identified,one of the principal research efforts of nutrition scientist is to determine how much of it is needed by people at various ages and stages of life. Initial studies usually are conducted with laboratory animals,but the information developed in these studies cannot be applied directly to humans since people's needs often are quite different from animals' needs. Human nutrition studies on the other hand,are time-consuming,costly,and difficult to conduct,especially because of the problems of controlling variables and possibly causing harm to the individuals involved. Because of the obstacles to collecting accurate data,our present knowledge of nutrient needs is incomplete,and the requirements of humans for many nutrients have not been established.However,the data on human and animal needs currently available are used by nutrition scientists to establish estimates of the amounts of essential nutrients per day that will meet the needs of most health persons. In the United States,the most widely used nutrient guidelines are the recommended dietary allowance (RDA),which are issued by the national academy of sciences,national research council,and food and nutrition board.The RDA serves as dietary of nutritional standards for a wide range ofage-weight-sex groups such as infants,children,adolescents,pregnant and lactating women,and younger and older adults. They are recommendations,not average requirements,for satisfactory levels of intake of essential nutrients of population groups of average,healthy people. They do not take account of special needs certain individuals may have due to genetic make up,metabolic disorders,chronic infections,and other abnormalities,which may result in their needing different levels of nutrients.MARGIN of SAFETY ALLOWS for INDIVIDUAL DIFFERENCESTo allow for individual difference,the usually are set with a generous margin of safety. Thus,they are thought to meet the needs of 95 to 97 percent of the people within each age-sex group. In other words,the RDA exceed the requirements of most individuals to ensure that the needs of nearly all are meet. For this reason,a person who consumes a diet that provides less than the RDA for one or more essential nutrients is not necessarily getting a diet that is nutritionally inadequate. What can be concluded,however,is that the farther the intake of an essential nutrient falls below the RDA,the greater the probability of nutritional inadequacy,on the other hand,if an individual is getting all the essential nutrients at or above the RDA level of his or her age,chances are good that diet is nationally adequate.An exception is the RDA for energy or calories,which are not designed,as guides for individual caloric needs. Other variables not included in the RDA,such as body size and physical activity,are involved in an individual's caloric requirements.DIFFERENCES IN NUTRIENT UTILIZATION CONSIDEREDAnother factor considered when the RDA are established is the availability of the nutrient and factors that affect how efficiently it is used in the body. For some nutrients,such as iron,absorption or use in the body may be incomplete;so the RDA needs to be set high enough to allow for this. And because in the case of certain other nutrients,substance in food ,called precursors,may be converted into the nutrient in the body ,the RDA needs to allow for this .An example is carotene, the orange-colored substance found in carrots and other vegetables and fruits,which our bodies convert to vitamin A.On the other side of the coin,receiving too much of certain nutrients,amounts significantly above the RDA,can be just harmful as not obtaining enough. Certain vitamins (such as A and D)and minerals can be highly toxic if high doses are used over a period of time.Thus,the RDA can serve as guidelines for optimal nutrient intake from the standpoint of both maximum and minimum levels.Vocabulary:maze n. ①迷宫,迷津,曲径;②混乱,迷惑vt.①使如入迷津②使困惑,使为难‖~d a.迷惘的,困惑的corridor n. ①走廊,回廊,通路②走廊地带③空中走廊diversity n.①差异,不同②多样性,变化in between 在中间,每间隔,在…期间commonsense 有常识的,明明白白的,一望而知的commonsensible (符合)常识的guideline n.①指导路线,方针,准则,指标②指路绳;样张,样行,标线interchangeable ①可交换的,可交替的②可互换的interdependent 互相依赖的,互相依存nourishment ①食物,滋养品②营养情况nutrient ①营养的,滋养的②营养素,营养物consume vt.①消费,消耗,浪费,吃光,喝光②消灭,毁灭vi.消灭,毁灭,消磨,(花,叶等)枯萎(away)be ~d with 被…所吞噬;因(忧愁,妒嫉)而变的憔悴nutrition 营养nutritional 营养的nutritive 营养的,滋养的,食品的,食物的odor气味odorant ①有香气的,有气味的②任何有气味的物体flavor ①味,香味,风味,滋味②食用香料③食用香精④调料category n.①种类,部属,类目②范畴,类型③范畴carbohydrate 碳水化合物,糖类mineral 矿物质,食品中的痕量物质vitamin 维生素,维他命get along 过活,生存essential a.①本质的,实质的,基本的②必需的,必不可少的③提炼的,精华的n.①本质,实质②要素,要点,必需品whereby ad.①(疑问副词)靠什么②(关系副词)靠那个A device ~to get warmth取暖的设备metabolism 新陈代谢,代谢(作用)intravenous feeding 静脉进食vein n.①静脉,血管②性情,气质,才干,语调,风格,意向③纹理,木纹vital 生命的;生机的;维持生命所必需的optimum n.(生长繁殖的)最适条件;最适度 a.最适的facet n. ①(多面体的)面,(宝石等的)刻面,小(平)面②(题目,性格,思想等的)某一方面vt. 在…上刻面intake n. ①吸入,纳入,收纳②纳入(数)量③(水、气体流入沟、管的)入口④被收纳的东西⑤摄取~of food食物摄取availability n.①可用性,有效性,效力②可得性,可得到的东西(或人员)identify vt.①使等同于,认为…一致(with)②认出;识别,鉴定,验明③确定…在分类学上的位置vi.一致,成为一致fascinate vt.①迷住,使神魂颠倒,强烈地吸引住②使呆住,蛊惑vi.迷人,极度吸引人fascinator n.①迷人者②网眼毛披巾macronutrient 主要营养micronutrient 微量营养micro- ①小,微,微量,百万分之一②放大,扩大microphone,microscopeascorbic acid 抗坏血酸niacin 烟酸,尼克酸thiamine 硫胺素riboflavim 核黄素VB2folacin 叶酸(=folic acid)pantothenic acid 泛酸pyridoxine 吡哆醇,吡哆素,维生素B6 biotin 生物素macroelement 主要成分microelement 微量成分sodium 钠potassium 钾phosphorus 磷phosphorous 磷的,亚磷的,含磷的costly a.①昂贵的,代价高的②价值高的,豪华的obstacle n.障碍(物),妨碍pregnant a.①怀孕的,怀胎的,孕育着的,充满的,富有的②意义深长的,含蓄的③富于想象力的,有创造力的④富于成果的,多产的lactate vi.①分泌乳汁②喂奶,授乳n.乳酸盐(或酯)calcium ~乳酸钙lactation n.genetic a. ①创始的,发生的②遗传学的gene n. 基因chronic infection n.①传染,侵染②传染病③影响,感染chronic a.①长期的,慢性的②惯常的,经常的③剧烈的,顽固的n.患慢性病的人abnomality n.①反常,变态,不规则②反常的事物,畸形council n.①政务会,理事会,委员会②商讨会,讨论会议chance n.①机会②可能性,或然性③偶然性,运气a.偶然的vi.碰巧;偶然发生vt.冒…险precursor n.①先驱者,先锋②前辈,前任③预兆,先兆carotene n.胡萝卜素;叶红素carrot n.①胡萝卜②红头发(的人)③政治诱骗,不能兑现的允诺carroty a.①胡萝卜色的②红发的standpoint n.主场,观点。