阅读理解训练题74

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1、阅读理解训练题（七十四）A　　Beforeanewairlinergoesintoservice,everypartofitistestedagainandagain.Buttherearetwoteststhataremoreimportantthanalltheothers.Inthefirsttest,amodernairlinermustflyatveryhighaltitudes.Airmustbepumpedintotheplacesothatthepassengerscanbreathe.Themetalstructureofthe

2、planehastobeverystrongforthisreason.Whentheplaneisfilledwithair,theairpressesagainsttheskinoftheplaneinside.Thepressureonasmallwindow,forexample,islikeahugefootthatistryingtogetout.Ifasmallpartoftheplaneweretocrack（爆裂）,theplanewouldexplodeinthesky.Inordertotestthestructureoft

3、heplane,itisloweredintoahugetankofwater.Thenitisfilledwithair.Thepressureinsidetheplaneisgreaterthaniteverwillbewhenitisintheair.Finally,thereisanexplosion.Engineerscandiscoverwhichpartoftheplanehascracked.　　Inthesecondtest,thetestpilotmustfindexactlywhathappenswhenalltheengi

4、nesareshutoffatonce.Hetakestheplaneupveryhigh.Thenheshutstheenginesoff,theplanebeginstofalllikeastone.itisthepilot’sjobtofindouthowhecangetcontroloftheplaneagain.Thesetwotestsareexamplesofhowplanesaremadesafebeforetheyevercarrypassengers.　　56．Whymustairbepumpedintotheplane?　　

5、A.Becausewithoutairtheplanecan’tfly.　　B.Becausetheplaneneedsairforitsrefueling.　　C.Becausethepassengers’livesdependonair.　　D.Becausethepassengershavepaidforit.　　57．Whatwouldhappenifasmallpartoftheplanewascracked?　　A.Theplanewouldnotgoforward.　　B.Theplanewouldexplode.　　C.Thepl

6、anewouldfalldown.　　D.Theplanewouldflyslowly.　　58．Forwhatpurposedoesthepilotshutoffalltheengines?　　A.Tofindoutexactlywhathappens.　　B.Tosavefuel.　　C.Toflyevenmoreslowly　　D.Tokeepbalance（平衡）B　　RobertSpring,a19thcenturyforger（造者）,wassogoodathisprofessionthathewasabletomakehislivi

7、ngfor15yearsbysellingfalsesignaturesofAmericans.SpringwasborninEnglishin1813andarrivedinPhiladelphiain1858toopenabookstore.AtfirsthebecamerichbysellinghissmallbutrealcollectionofearlyU.S.autographs（手稿）.Discoveringhisabilityatcopyinghandwriting,hebeganimitatingsignaturesofGeor

8、geWashingtonandBenFranklinandwritingthemonthetitlepagesofoldbocks.To