新托福测试题.docx
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新托福测试题.docx
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新托福测试题
新托福测试题
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1.
Whatisthemainreasonthatpeopledevelopedmethodsofrefrigeration?
Theywantedtoimprovetheflavorandnutritionalvalueoffood.
Theyneededtoslowthenaturalprocessesthatcausefoodtospoil.
Theyneededausefortheicethatformedonlakesandrivers.
Theywantedtoexpandtheproductionofcertainindustries.
2.
Thewordperishableinparagraph1isclosestinmeaningto
capableofspoiling
uncooked
ofanimalorigin
highlynutritious
3.
Whatcanbeinferredfromparagraph1aboutcoldstoragebeforetheinventionofartificialrefrigeration?
Itkeptfoodcoldforonlyaboutaweek.
Itwasdependentonasourceoficeorsnow.
Itrequiredacontainermadeofmetalorwood.
Itwasnotasafemethodofpreservingmeat.
4.
ArtificialrefrigerationinvolvesallofthefollowingprocessesEXCEPT
thepumpingofwatervaporthroughapipe
therapidexpansionofcertaingases
theevaporationofavolatileliquid
thetransferofheatfromoneplacetoanother
5.
Whichsentencebelowbestexpressestheessentialinformationinthehighlightedsentenceinparagraph2?
Incorrectchoiceschangethemeaninginimportantwaysorleaveoutessentialinformation.
Ittakesalotofenergytotransformaliquidintoavapor,especiallywhenthevaporlosesheat.
Somegasesexpandrapidlyandgiveoffenergywhentheyencounteraverycold
THEDEVELOPMENTOFREFRIGERATION
Coldstorage,orrefrigeration,iskeepingfoodattemperaturesbetween32and45degreesFinordertodelaythegrowthofmicroorganisms—bacteria,molds,andveast—thatcausefoodtospoil.Refrigerationproducesfewchangesinfood,someats,fish,eggs,milk,fruits,andvegetableskeeptheiroriginalflavor,color,andnutrition.Beforeartificialrefrigerationwasinvented,peoplestoredperishablefoodwithiceorsnowtolengthenitsstoragetime.Preservingfoodbykeepingitinanice—filledpitisa4,000-year-oldart.Coldstorageareaswerebuiltinbasements,cellars,orcaves,linedwithwoodorstraw,andpackedwithice.Theicewastransportedfrommountains,orharvestedfromlocallakesorrivers,anddeliveredinlargeblockstohomesandbusinesses.
Artificialrefrigerationistheprocessofremovingheatfromasubstance,container,orenclosedarea,toloweritstemperature.Theheatismovedfromtheinsideofthecontainertotheoutside.Arefrigeratorusestheevaporationofavolatileliquid,orrefrigerant,toabsorbheat.Inmosttypesofrefrigerators,therefrigerantiscompressed,pumpedthroughapipe,andallowedtovaporize.Astheliquidturnstovapor,itlosesheatandgetscolderbecausethemoleculesofvaporuseenergytoleavetheliquid.Themoleculesleftbehindhavelessenergyandsotheliquidbecomescolder.Thus,theairinsidetherefrigeratorischilled.
Scientistsandinventorsfromaroundtheworlddevelopedartificialrefrigerationduringtheeighteenthandnineteenthcenturies.WilliamCullendemonstratedartificialrefrigerationinScotlandinl748,whenheletethyletherboilintoapartialvacuum.Inl805,AmericaninventorOliverEvansdesignedthefirstrefrigerationmachinethatusedvaporinsteadofliquid.Inl842,physicianJohnGorrieusedEvans’sdesigntocreateanair-coolingapparatustotreatyellow—feverpatientsinaFloridahospital.Gorrielaterlefthismedicalpracticeand
liquid.
Whenkineticenergyischangedtoheatenergy,liquidmoleculesturnintovapormolecules.
Duringevaporation,thevapormoleculesuseenergy,andtheliquidbecomescolder.
6.
Accordingtothepassage,whowasthefirstpersontouseartificialrefrigerationforapracticalpurpose?
WilliamCullen
OliverEvans
JohnGorrie
AdolphusBusch
7.
Theworditinparagraph3refersto
printer
refrigerator
type
ether
8.
Whydoestheauthordiscussthebrewingindustryinparagraph4?
Tocomparecavestoragewithmechanicalrefrigeration
Todescribetheuniqueproblemsthatbrewersfaced
Topraisetheaccomplishmentsofaprominentbrewer
Toshowhowrefrigerationchangedawholeindustry
9.
Thewordconstrainedinparagraph4isclosestinmeaningto
restricted
spoiled
improved
alternated
10.
Accordingtothepassage,thefirstrefrigeratedrailcarusedwhatmaterialasacoolingagent?
Ether
Ice
Ammonia
CFCs
11.
Thewordtoxicinparagraph5isclosestinmeaningto
experimentedwithicemaking,andinl85lhewasgrantedthefirstU.S.patentformechanicalrefrigeration.Inthesameyear,anAustralianprinter,JamesHarrison,builtanetherrefrigeratorafternoticingthatwhenhecleanedhistypewithetheritbecameverycoldastheetherevaporated.Fiveyearslater,Harrisonintroducedvapor-compressionrefrigerationt
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