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1、2012英语专四考试词汇语法答案51-55BDBAC56-60ACDBC61-65BADCA66-70DBACB71-75BCBAD76-80CBADB2012英语专四考试阅读理解答案81-85CADBA86-90DBCAD91-95BADBBFlightsimulator(飞行模拟器)referstoanyelectronicormechanicalsystemfortrainingairplaneandspacecraftpilotsandcrewmemberbysimulatingflightconditions．Thepurposeofsim
2、ulationisnottocompletelysubstitute(1)_____actualflighttrainingbuttothoroughlyfamiliarizestudentswiththevehicle(2)_____beforethey(3)_____extensiveandpossiblydangerousactualflighttraining．Simulationsalsoisusefulforreviewandforfamiliarizingpilotswithnew(4)_____toexistingcraft． Tw
3、oearlyflightsimulatorsappearedinEnglandwithinadecadeafterthefirstflightofOrvilleandWilburWright．Theyweredesignedtoenablepilotstostimulatesimpleaircraft(5)_____inthreedimensions:noseupordown;leftwinghighandrightlow,orviceversa;and(6)_____toleftorright．Ittookuntil1929,however,for
4、atrulyeffectivesimulator,theLinkTrainer,toappear,devisedbyEdwinA．Link,aself-educatedaviatorandinventorfromBinghamton,NewYork．(7)_____,airplaneinstrumentationhadbeendevelopedsufficientlytopermit"blind"flyingoninstrumentsalone,buttrainingpilotstodosoinvolved(8)_____risk．Linkbuilt
5、amodelofanairplanecockpitequipped(9)_____instrumentpanelandcontrolsthatcouldrealisticallystimulateallthemovementsofanairplane．Pilotscouldusethedeviceforinstrumenttraining,manipulatingthecontrols(10)_____instrumentreadingssoastomaintainstraightandlevelflightor(11)_____climbordes
6、centwithnovisualreference(12)_____anyhorizonexceptfortheartificialoneontheinstrumentpanel．Thetrainerwasmodified(13)_____aircrafttechnologyadvanced．CommercialairlinesbegantousetheLinkTrainerforpilottraining,andtheUSgovernmentbeganpurchasingthemin1934,(14)_____thousandsmoreasWorl
7、dWarIIapproached． Technologicaladvancesduringthewar,particularlyinelectronics,helpedtomaketheflightsimulatorincreasingly(15)_____．Theuseofefficientanalogcomputersintheearly1950sledtofurtherimprovements．Airplanecockpits,controls,andinstrumentdisplayshadbythenbecomesoindividuali
8、zedthatitwasnolongerfeasibletouseageneralizedtrainerto
