step by step3000第三册unit6答案及原文.docx

step by step3000第三册unit6答案及原文.docx

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stepbystep3000第三册unit6答案及原文

英语专业学生经典的听力材料

Unit6ScienceandTechnology

PartIWarmingup

A1.

1.Thisnewsitemisaboutakindofnewbulletproofvestmadeofsilk.

2.ThisnewsitemisaboutresearchdonebyAmericanandJapaneseresearcherstopredictsevereweatherinandaroundtheIndianOcean.

3.ThisnewsitemisaboutachessmatchbetweenaworldchampionandtherestoftheworldontheInternet.

4.ThisnewsitemisaboutthesignificanceofthediscoveryofthestructureofDNA.

5.ThisnewsitemisaboutNEC'snewrobotthattalksandunder-standsorders.

A2

1.Whilesilkthreadsmaybesoft,theycanbeusedtoproduceastrongeryarnthancopperthreads.

2.AmericanandJapaneseresearchershavediscoveredastrongconnectionbetweenextremeweatherandconditionsintheocean.

3.Visitorstothesitehave24hourstovoteontheircountermovehelpedbyateamofyoungchessexpertswhowillsuggeststrategies.

4.Understandingitscodehashelpedtounlockthemechanicsofinheriteddisease,aswellasbeneficialbiologicaltraitssuchasintelligenceandbodystrength.

5.TherobotfromNECcanrecordandsendvideomailthroughtheInternetandswitchonTVs,VCRsandairconditioners.

Tapescript.

1.Thaisilkisknownforitsbeautyandelegance.Butaresearchteamhasfoundanewuseforit.AbulletproofvestmadeofsilkwasputtothetestatashootingrangeinThailand.Afterseveralroundsofgunfire,thevestwasexamined.Thebulletswerestuckinthefirstlayeroffifteenpiecesofsilk.Amemberoftheresearchteamsayswhilesilkthreadsmaybesoft,theycanbeusedtoproduceastrongeryarnthancopperthreads,thematerialusedinregularbulletproofvests.

2.AmericanandJapaneseresearcherssaytheyareastepclosertopredictingsevereweatherinandaroundtheIndianOcean.Researchershaveanalyzedweatherdatafromtheregionoverthepast40yearsandthey'vediscoveredastrongconnectionbetweenextremeweatherandconditionsintheocean.ABBCsciencecorrespondentsaysthefindingscouldmakeiteasiertopredictdroughtsor,indeed,periodsofheavyrainfall.

3.TheworldchesschampionGarryKasparovbeganamatchagainsttherestoftheworldontheInternet.Kasparovmadehisfirstmovewithameter-highpawnbeforeanaudienceofchessfansataparkinNewYork.ThemovewasimmediatelypostedonaspecialwebsitesetupbytheMicrosoftcorporation.Visitorstothesitehave24hourstovoteontheircountermovehelpedbyateamofyoungchessexpertswhowillsuggeststrategies.

4.FewscientificadvancesofthisoranymillenniumcanrivalinsignificancethediscoveryofthestructureofDNA,thebasicmoleculeoflife.KnowledgeofthestructureofDNAhelpsexplainsmanythings,includinggeneticmutationand,throughit,evolution.Understandingitscodehashelpedtounlockthemechanicsofinheriteddisease,aswellasbeneficialbiologicaltraitssuchasintelligenceandbodystrength.ThediscoveryoftheDNAmoleculealsopavedthewayformanyoftoday’scutting-edgesciences,includinggeneticengineering,acontroversialbranchofknowledgethatraisesnewethicalandmoralquestionsthatarecertaintobewithusfarintothenextmillennium.

5.Somesayit'shardtofindgoodhelpthesedays,butaJapaneseelectronicsfirmthinksit'sfoundtheanswer.It'sarobotthattalksandunderstandsorders.TherobotfromNECcanrecordandsendvideomailthroughtheInternetandswitchonTVsandVCRs.Andifit'sbecomingabitwarmforyou,onesimplecommandandtherobotwillswitchontheairconditioner.

B.

2.lightningpatronizing

XraysEnthusiatic

LaserBored

YeastFriendly/intimate

FrictionLoudlybutneutral

RecyclingPatiently

Tapescript:

1....Yes,yousee,it'stheforceofattractionbetweenanytwoobjects.Thestrengthoftheforcedependsonthemassoftheobjectsandthedistancebetweenthem.Er...themostobviouseffectisthewayobjectsonthesurfaceoftheearthareattractedtowardsthecenteroftheearth...

2....asitcomesdownitgoesrelativelyslowly100to1,000milesperhourandyoucan'tseeit,butthereturnstrokegoesupfromtheearthtothecloudanditgoesatover87,000milesperhourandthat'stheoneyoucansee,yousee,theonethatgoesbackup.It'sreallyjustaverylarge,powerfulspark.Thedistanceinmilesyouareawayfromitisthetimeinsecondsbetweenitandthesoundyouhear...

3....Well,theywerefirstdiscoveredin1895andtheycanpenetratematterthatisopaquetolight.Somematterismoretransparenttothemthanothers,whichmeansyoucanseeinsidesomebody.Theyareactuallyquitedangerousandpeoplewhoworkwiththemwearspecialprotectiveclothing...

4....ordinarylightconsistsofelectromagneticwavesofdifferentfrequenciesandphase（s）.Thisisabundleofwavesofthesamefrequencyandphase.Youcancreatethebeamsfromarubyrodoratubeofcarbondioxidethat'sstimulatedwithflashesofordinarylight.Thewordisanacronymforlightamplificationbythestimulatedemissionofradiation.Now,doesanybody...

5....they'realltypesoffungus.Therearemanydifferentkindsofthembutthebestknownaretheonesusedincookingandbrewing.Whenthey'remixedwithsugartheycausethesugartofermentandtwothingshappen:

firstcarbondioxideisgivenoffandsecondalcoholisformed,butwhentheproportionreaches12%,it'sallkilledoffnaturally...

6....incontactwitheachother,there'saresistancetomovementbetweenthem.Themainreasonwhyweuseballbearingsandlubricatingoilistocounteractthis;themainreasonwhyrubberisusedintiresandshoesistoincreasetheeffectofit...

7....No,it'stheprocesswherebymaterialsareusedagain.Normally,itischeapertodothisbecauseit'smoreenergy-efficient.Ontheotherhand,onematerialthat'shardtodealwithinthiswayisplastic--therearesomanytypesthatit'sverydifficulttoseparate...

PartII

A:

1.identify,Catalog,mapandanalyze/100,000

2.A:

apieceofDNA,thebasicMoleculeoflife

B:

onchromosomesineverycells

C:

producechemicalinstructionsthecellneedsinordertobuildandrunthehumanbody.

III:

Significance

A:

cureorprevent

B:

desirablegenetictraits

C:

thebrain,consciousnessandthemind

D:

ascientificdescription

IVcontroversy

Abuse

2.warfare

囊性纤维变性

听力原文：

Thegoalofthehumangenomeprojectinitiatedintheearly1990sistoidentify,catalog,mapandanalyzeeveryoneoftheestimated100,000genesinthehumanbody.Ifthemulti-billion-dollarprojectissuccessful,itseffectsmaybeasfundamentaltothehumanfutureasthediscoveryoffireandseedagricultureoncewere.

Tounderstandthesignificanceofthehumangenomeproject,itisnecessarytoknowthateachgeneisapieceofDNA,thebasicmoleculeoflife.Genesarelocatedonchromosomesthatinturnresideineverycellinarrangementssimilartothealternatelycoloredrungsonaladder.Thesequenceofgeneticrungsproducesthechemicalinstructionsthecellsneedinordertobuildandrunthehumanbody.Byidentifyingthelocationandmakeupofeachgene,thegenomeprojectshouldhelpscientistscureor

PartIIILatestbreakthroughsintechnology

A.

1.Whatisthetrendforelectronicsinthefuture?

Integrated,smaller,faster,better

2.Whatisthethemeforelectronicsinthefuture?

Thecombinationofcomputersandcommunicationsandthenhavingthemdisappearfromoursight

B.

Tapescript:

"Everybodythinksoftechnologyassomebodyinalabcoat,youknow,tinkeringwithcomputerchips,buttechnologyisreallyabouthowweliveandhowwecommunicate."

SuzanneCantraisthe"What'sNew?

"editoratPopularSciencemagazine,amagazinethathasbeenfollowingadvancesintechnologyformorethanahundredyears.

Themostfancifuldreamofmankindistodayastartlingreality."Rememberwhentelevisionwasconsideredafadofthefuture?

"Itmaynotbelongbeforeournewseventsandcurrentworldhappeningswillbewitnessedinthousandsofhomes."Boy,weretheywrong?

Thisrecordershowshowfartelevisionhascome.T-Bo'spersonalTV,anNBCinvestment,isoneoftheproductsthatcaughtCantra'seye.

"Oneofthebenefitsofhavingacomputerrecordingvideoisthatthecomputercanreadthevideobroadcastasitcomesinsoifthephonerings,youcanhitpauseonalivebroadcast."

Andnotonlythat,thissortofsmartVCRlearnswhichTVshowsandcharactersyouliketowatchandrecordsthemforyou.Thisdeviceisonlyoneofahundreditems,Cantrasays,bestrepresentsthefuture.Andwhilewecouldn'tshowyouallofthem,hereareafewthatreflectsomeofthenewtrends.

LikeEricsson'sR380.Youcanmakecalls,browsetheweb,checkyourcalendarandsendandreceiveemail,allinthisonedevice.

"Thiscellphoneactuallyshowsusthefutureofintegrateddevices."

AndIbetyoucan'tguesswhatthisis?

Althoughitlookslikeawatch,infact,it'sacamera.That'sright.Acamera.

"TheP3wristcamerasortoftalkstothatwholeconceptofminiaturizationandhavingdevicesintegratedintothingsthatyouwouldn'tthinkof."

Andwhilethepicturesareprettygood,onlyyoucandecidewhetherthey'reworthtwogrand.

Andhowaboutthis?

It'saprototypecomputerthatputsyourmobilelaptoptoshame.

"TheIBMwearablePCdefinitelygivesyouavisionintowhat'sgonnabecomingdowntheline.Wewillbecarrying（becarriedeasily）thesekindsofcomputingdevicesandyouwillneedtoonlyaccesstheinformationsomehow.Whetherthat'sthroughanearpieceorwhetherit'sjustintegratedintoyourclothing."

ThePCweighslessthanapoundandclipsontoyourbelt.Themonitor,aboutthesizeofapencaprestsan