参考答案

正确答案：C
LocatedattheNASAresearchcenterinIowa,thereisa5000galloncontainerofwater.AndinsidethetankisanunderwatertreadwheeldesignedbyDavanNewman,anaerospaceengineer.Forfouryears,NewmanobserveddiversastheysimulatedwalkingonthemoonandonMarsonherunderwatermovingbelt.ShewantedtodiscoverhowthegravityofthemoonandofMarswouldaffecthumanmovement.[32]Todothis,Newmanattaebedweightstothediversandthenloweredthemintothetankandontothetreadwbeel.TheseweightswerecarefullyadjustedsothatthediverscouldexperienceunderwaterthegravityofthemoonandofMarsastheywalkedonthetreadwheel.[33]NewmanconcludedthatwalkingonMarswillprobablybeeasierthanwalkingonthemoon.ThemoonhaslessgravitythanMarsdoes.Soatlunargravitythediversstruggledtokeeptheirbalanceandwalkedawkwardly.ButatMartiangravity,thedivershadgreatertractionandstabilityandcouldeasilyadjusttoapaceof1.5milesperhour.[34]AsNewmangraduallyincreasedthespeedofthetreadwheel,thediverstooklonger,gracefulstridesuntiltheycomfortablysettledintoanevenquickerpace.NewmanalsonotedthatatMartiangravity,thediversneededlessoxygen.ThedataNewmancollectedwillhelpinthefuturedesignofMartianspacesuits.[35]Comparetolunarspacesuits,Martianspacesuitswillrequiresmallerairtanks.Andtoallowforfreermovement,theelbowandkneeareasofthespacesuitswillalsobealtered.32.WhatdidNewmanchangeSothatthediverscouldexperiencedifferentgravitylevels?33.WhywillMartianspacesuitsbedesigneddifferentlyfromlunarspacesuits?34.WhathappenedtothediversatMartiangravitywhenthespeedofthetreadwheelwasincreased?35.WhatisonewaythatthedesignofMartianspacesuitswilldifferfromlunarspacesuits?【解题思路】1．三项提到了水(water)或潜水员(diver)，本题可能跟水有关。2．四项各表示一个因素。结论：本题考查与水有关的一个因素。【解析】短文开头提到了一个水下踏车，纽曼用它来观察模仿在月球和火星行走的潜水员。纽曼想发现月球和火星的引力如何影响人类行动。当潜水员在水下踏车上行走的时候，她通过调整系在潜水员身上的重量来使其感受月球和火星的引力，因此答案为C。