题目内容：
Questionsarebasedonthefollowingpassage:Accordingtotheairlineindustrystatistics,almost90%ofairlineaccidentsaresurvivableorpartiallysurvivable.Butpassengerscanincreasetheirchancesofsurvivalbylearningandfollowing
certaintips.Expertssaythatyoushouldreadandlistentosafetyinstructionsbeforetakeoffandaskquestionsifyouhaveuncertainties.Youshouldfastenyourseatbeltlowonyourhipsastightlyaspossible.Ofcourse,youshouldalsoknowhowthereleasemechanismofyourbeltoperates.Duringtakeoffsandlandingsyouareadvisedtokeepyourfeetflatonthefloor.Beforetakeoffyoushouldlocatethenearestexitandanalternativeexitandcounttherowsofseatsbetweenyouandtheexits
sothatyoucanfindtheminthedarkifnecessary.
Intheeventthatyouareforewarnedofapossibleaccident,youshouldputyourhandsonyouranklesandkeepyourheaddownuntiltheplanecomestoacompletestop.Ifsmokeispresentinthe
cabin,youshouldkeepyourheadlowandcoveryourfacewithnapkins,towels,orclothing.Ifpossible,wettheseforaddedprotectionagainstsmokeinhalation.Toevacuateasquicklyaspossible,
followcrewcommandsanddonottakepersonalbelongingswithyou.Donotjumponescapeslidesbeforetheyarefullyinflated,andwhenyoujump,dosowithyourarmsandlegsextendedinfront
ofyou.Whenyougettotheground,youshouldmoveawayfromtheplaneasquicklyaspossible,andneversmokenearthewreckage.
Accordingtotheexperts,whenshouldtravelersreadandlistentosafetyinstructions? A．Throughouttheflight
B．Duringlandings
C．Beforetakeoff
D．Inanemergency
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答案解析：