在word的编辑状态,连续进行了两次"插入"操作,当单击一次"撤消"按钮后()

A、将两次插入的内容全部取消
B、将第一次插入的内容全部取消
C、将第二次插入的内容全部取消
D、两次插入的内容都不被取消
查看答案
正确答案:

C

答案解析:

暂无解析

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It____alsocreatemorefocusedteamsandlesswastedtime.

A、is
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ReadingComprehension

SectionA

Directions:Therearetenincompletesentencesinthissection.ForeachsentencetherearefourchoicesmarkedA,B,CandD.ChoosetheONEthatbestcompletesthesentence.Thenwritedowntherightanswerinthebracketsforeachsentence.Thissectiontotals10points,onepointforeachsentence.

()1.Wecansupplyallthebicyclesyourequired____________stockandarearrangingshipmentbyM.V.Mermaid.

A.forB.from C.to D.against

()2.Wewouldliketoremindyouthatthe__________L/CmustreachusbeforeMarch10

sothatwecanmakeshipmentingoodtime.

A.coveringB.cover C.coveredD.beingcovered

()3.Wehavereceivedyourletterof28March,___________ustomodifythepreviousarrangementsfortheshipmentofthecaptionedorder.

A.askedB.toask C.beingaskedD.asking

()4.InourletterofMay5,wemade__________clearthatshipmentistobeeffectedinJune.

A.youB.them C.thatD.it

()5.Wealwaysdeal_______________paymentbysightL/C.

A.with B.in C.at D.on

()6.Thisofferis_____________toyourreplyreachingusbeforethe20thofFebruary.

A.subjectingB.subject C.subjectedDtosubject

()7.____________weareappreciatingthegoodqualityofyourblacktea,weregretthatyourpriceappearstobeonthehighside.

A.WhileB.When C.HoweverD.Therefore

()8.Weherebyauthorizeyouto___________onusat60daysaftersighttotheextentofUSD20,000.00.

A.open B.establish C.draw D.build

()9.Ifpartiestoacontractdesiretosettledisputes,anarbitrationclauseisusuallymadeinthecontractwellbeforeadispute_____________.

A.risesB.arisesC.lookD.appear

()10.Somecustomersrequestedusto_____________ourpricebecausetheyconsideredit

toohigh.

A.putdownB.getdownC.takedown D.bringdown

Exercisephysiologist

Roguetheoryofsmellgetsaboost

1.Acontroversialtheoryofhowwesmell,whichclaimsthatourfinesenseofodourdependsonquantummechanics,hasbeengiventhethumbsupbyateamofphysicists.

2.CalculationsbyresearchersatUniversityCollegeLondon(UCL)showthattheideathatwesmellodourmoleculesbysensingtheirmolecularvibrationsmakessenseintermsofthephysicsinvolved.

3.That'sstillsomewayfromprovingthatthetheory,proposedinthemid-1990sbybiophysicistLucaTurin,iscorrect.Butitshouldmakeotherscientiststaketheideamoreseriously.

4."Thisisabigstepforward,"saysTurin,whohasnowsetuphisownperfumecompanyFlexitralinVirginia.Hesaysthatsincehepublishedhistheory,"ithasbeenignoredratherthancriticized."

5.Mostscientistshaveassumedthatoursenseofsmelldependsonreceptorsinthenosedetectingtheshapeofincomingmolecules,whichtriggersasignaltothebrain.Thismolecular'lockandkey'processisthoughttoliebehindawiderangeofthebody'sdetectionsystems:itishowsomepartsoftheimmunesystemrecogniseinvaders,forexample,andhowthetonguerecognizessometastes.

6.ButTurinarguedthatsmelldoesn'tseemtofitthispictureverywell.Moleculesthatlookalmostidenticalcansmellverydifferent—suchasalcohols,whichsmelllikespirits,andthiols,whichsmelllikerotteneggs.Andmoleculeswithverydifferentstructurescansmellsimilar.Moststrikingly,somemoleculescansmelldifferent—toanimals,ifnotnecessarilytohumans—simplybecausetheycontaindifferentisotopes(atomsthatarechemicallyidenticalbuthaveadifferentmass).

7.Turin'sexplanationforthesesmellyfactsinvokestheideathatthesmellsignalinolfactoryreceptorproteinsistriggerednotbyanodourmolecule'sshape,butbyitsvibrations,whichcanenourageanelectrontojumpbetweentwopartsofthereceptorinaquantum-mechanicalprocesscalledtunnelling.Thiselectronmovementcouldinitiatethesmellsignalbeingsenttothebrain.

8.Thiswouldexplainwhyisotopescansmelldifferent:theirvibrationfrequenciesarechangediftheatomsareheavier.Turin'smechanism,saysMarshallStonehamoftheUCLteam,ismorelikeswipe-cardidentificationthanakeyfittingalock.

9.Vibration-assistedelectrontunnellingcanundoubtedlyoccur—itisusedinanexperimentaltechniqueformeasuringmolecularvibrations."Thequestioniswhetherthisispossibleinthenose,"saysStoneham'scolleague,AndrewHorsfield.

10.StonehamsaysthatwhenhefirstheardaboutTurin'sidea,whileTurinwashimselfbasedatUCL,"Ididn'tbelieveit".But,headds,"becauseitwasaninterestingidea,IthoughtIshouldproveitcouldn'twork.Ididsomesimplecalculations,andonlythenbegantofeelLucacouldberight."NowStonehamandhisco-workershavedonethejobmorethoroughly,inapapersoontobepublishedinPhysicalReviewLetters.

11.TheUCLteamcalculatedtheratesofelectronhoppinginanosereceptorthathasanodorantmoleculeboundtoit.Thisratedependsonvariouspropertiesofthebiomolecularsystemthatarenotknown,buttheresearcherscouldestimatetheseparametersbasedontypicalvaluesformoleculesofthissort.

12.Thekeyissueiswhetherthehoppingratewiththeodorantinplaceissignificantlygreaterthanthatwithoutit.Thecalculationsshowthatitis—whichmeansthatodouridentificationinthiswayseemstheoreticallypossible.

13.ButHorsfieldstressesthatthat'sdifferentfromaproofofTurin'sidea."Sofarthingslookplausible,butweneedproperexperimentalverification.We'rebeginningtothinkaboutwhatexperimentscouldbeperformed."

14.Meanwhile,Turinispressingaheadwithhishypothesis."AtFlexitralwehavebeendesigningodorantsexclusivelyonthebasisoftheircomputedvibrations,"hesays."Oursuccessrateatodorantdiscoveryistwoordersofmagnitudebetterthanthecompetition."Attheveryleast,heisputtinghismoneywherehisnoseis.

Questions5-9

Completethesentencesbelowwithwordsfromthepassage.UseNOMORETHANTHREEWORDSforeachanswer.

5.Thehypothesisthatwesmellbysensingthemolecularvibrationwasmadeby______.

6.Turin'scompanyisbasedin______.

7.Mostscientistsbelievedthatournoseworksinthesamewayasour______.

8.Differentisotopescansmelldifferentwhen______weighdifferently.

9.AccordingtoAudrewHorsfield,itisstilltobeprovedthat______couldreallyoccurinhumannose.

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