B Have you ever wondered? 1.Why do airplanes take longer to fly west than east? It can

B

Haveyoueverwondered?

1.Whydoairplanestakelongertoflywestthaneast?

Itcantakefivehourstogowest-eastfromNewYork(NY)toLondonbutsevenhourstotr aveleast-westfromLondontoNY.Thereasonforthedifferenceisanatmosphericphenomenonknowasthejet(喷射)str eam.Thejetstr eamisaveryhighaltitudewindwhichalwaysblowsfromthewesttotheeastacrosstheAtlantic.Theplanesmovementaconstamsairspeedthusgofasterinthewest-eastd irectionwhentheairmovingwiththewindthanintheoppositedirection.

2WhatwouldhappenifthegravityonEarthwassuddenlyturnedoff?

Supposingwecouldmagicallyturnoffgravity.Wouldbuildingsandotherstr ucturesfloataway?Whathappenedwoulddependonhowstr onglythethingswereattachedtotheEarth.TheEarthismovingatquiteaspeedmovingatoverathousandmilesperhour.Ifyouturnsomethingroundyourheadonastr ing,itgoesaroundinacircleuntilyouletgoofthestr onggoofthestr ing.ThingsnotattackedtotheEarthwouldflyoffinastr aightline.Peopleinbuildingswouldsuddenlyshootupwardsatagreatspeeduntiltheyhittheceiling.Mostthingswouldflyoffintospace.

60.Whatinformationcoawegetfromthefirstpassage?

A.tistheietstoomnthataffeetshowfastairplanesfly.

B.Planesgoslowerwhentheyaremovingwiththewind.

C.IttakesmoretimetoflyfromNYtoLondonthanfromLondontoNY.

D.Thejetstr eamalwaysblowsfromtheeasttothewestacrosstheAtantic.