资源描述:
《新托福检测试题》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、.....阅读学习参考.....1.Whatisthemainreasonthatpeopledevelopedmethodsofrefrigeration?Theywantedtoimprovetheflavorandnutritionalvalueoffood.Theyneededtoslowthenaturalprocessesthatcausefoodtospoil.Theyneededausefortheicethatformedonlakesandrivers.Theywantedtoexpandtheproductionofcertainindus
2、tries.2.Thewordperishableinparagraph1isclosestinmeaningtocapableofspoilinguncookedofanimaloriginhighlynutritious3.Whatcanbeinferredfromparagraph1aboutcoldstoragebeforetheinventionofartificialrefrigeration?Itkeptfoodcoldforonlyaboutaweek.Itwasdependentonasourceoficeorsnow.Itrequiredac
3、ontainermadeofmetalorwood.Itwasnotasafemethodofpreservingmeat.4.ArtificialrefrigerationinvolvesallofthefollowingprocessesEXCEPTthepumpingofwatervaporthroughapipetherapidexpansionofcertaingasestheevaporationofavolatileliquidthetransferofheatfromoneplacetoanother5.Whichsentencebelowbes
4、texpressestheessentialinformationinthehighlightedsentenceinparagraph2?Incorrectchoiceschangethemeaninginimportantwaysorleaveoutessentialinformation.Ittakesalotofenergytotransformaliquidintoavapor,especiallywhenthevaporlosesheat.Somegasesexpandrapidlyandgiveoffenergywhentheyencountera
5、verycoldTHEDEVELOPMENTOFREFRIGERATIONColdstorage,orrefrigeration,iskeepingfoodattemperaturesbetween32and45degreesFinordertodelaythegrowthofmicroorganisms—bacteria,molds,andveast—thatcausefoodtospoil.Refrigerationproducesfewchangesinfood,someats,fish,eggs,milk,fruits,andvegetableskeep
6、theiroriginalflavor,color,andnutrition.Beforeartificialrefrigerationwasinvented,peoplestoredperishablefoodwithiceorsnowtolengthenitsstoragetime.Preservingfoodbykeepingitinanice—filledpitisa4,000-year-oldart.Coldstorageareaswerebuiltinbasements,cellars,orcaves,linedwithwoodorstraw,and
7、packedwithice.Theicewastransportedfrommountains,orharvestedfromlocallakesorrivers,anddeliveredinlargeblockstohomesandbusinesses.Artificialrefrigerationistheprocessofremovingheatfromasubstance,container,orenclosedarea,toloweritstemperature.Theheatismovedfromtheinsideofthecontainertoth
8、eoutside.Are