Thiscarisveryexpensive.Youhavetopayhalfamilliondollars________it.
典型的甲状腺功能减退症患者可见()面容。
有机磷杀虫药进人体内后在___________脏内浓度最高，主要通过___________脏排泄。
一般认为脑组织对缺氧的耐受时限是___________分钟，超过则预后不良。
preferred,prefers,is,are,was,were,willbe,shallbeDuringtheholidayweek,one-thirdofthestudentsinourclass________preparedtostayoncampusforstudywhilearoundtenpercentofthem________somemoresleepathome.
疾病不仅是体内的病理过程，而且是()适应的失败。
护理人员应设身处地的为患者着想，主动关心、耐心细致做好术前________，解除其种种疑虑，最终能使患者以稳定的情绪和乐观的态度迎接手术。保证手术顺利进行的基础和手术成功的必要条件是________。
事实前提的特点主要表现在（）、（）和()三个方面。
Withouttransportation,therecouldbenotrade.Withouttrade,therecouldbenotownsandcities.Townsandcities aretraditionallythe___16___ofcivilization.Therefore,transportationhelpsmakecivilization___17___.
Throughoutmostoftheprehistoricperiod,peoplelivedbyhunting,fishing,and___18___wildplants.They hadnobeastsofburden,wheeledvehicles,orroads.Peopletraveled___19___andcarriedtheirinfantsand belongingsstrappedtotheirbacksorheads.Loadstooheavyforonepersontocarrywerestrappedtoapoleandcarriedbytwopeople.
___20___,peoplelearnedthattheycoulddragloadsalongthegroundonsledges.Duringlateprehistoric times,peoplebegantobuildsledgeswithrunners. Whenpeopledevelopedagricultureandbegantoestablish___21___settlements,tradebetweensettlements
startedtodevelop,whichcreatedaneedforbetter___22___oftransportation.Thedonkeyandtheox,whichhad beentamedforfoodproductsandfarmwork,helped___23___thisneed.Theuseofdonkeysandoxenasbeastsof burdenenabledpeopleto___24___heavierloadsthantheycouldbefore.
Peoplealsobegantodevelopwatertransportationduringprehistorictimes.Theybuiltraftsofsuch__25____aslogs orreeds.Later,peoplelearned___26___tomakedugoutsandcanoes.Peoplepaddledtheseearlycraftwiththeirhands
orpropelledthemwithpaddlesor__27____.
Thewheelwasinventedabout3500B.C.andsailboatabout3200B.C.Wheeledvehiclesandsailingvessels___28___transportation.Butthespeedoftransportationimprovedonly___29___overthecenturies.Inventorsproducedthefirstengine-___30___vehiclesduringthelate1700’sandtheearly1800’s.This developmentmarkedthebeginningofarevolutionintransportationthathascontinuedtothepresent.
16.A.highlightsB.pinpointsC.headquartersD.centers
17.A.possibleB.acceptableC.practicalD.typical
18.A.growingB.gatheringC.wateringD.moving
19.A.inturnB.ateaseC.onfootD.forfun
20.A.AllthewhileB.ForawhileC.IntimeD.Ontime
21.A.temporaryB.permanentC.regularD.steady
22A.knowledgeB.judgmentC.standardsD.means
23.A.recognizeB.developC.meetD.reduce
24.A.bearB.moveC.shareD.lift
25.A.materialsB.stylesC.itemsD.types
26.A.whereB.whenC.howD.as
27.A.polesB.sailsC.currentsD.winds
28.A.demonstratedB.revolutionizedC.witnessedD.initiated
29.A.considerablyB.continuouslyC.swiftlyD.slightly
30.A.poweredB.controlledC.orientedD.related
接受化疗后最常见的毒性反应是_________、_________、_________.