根据下列内容，回答216-220题。 Themenwhoracethecarsaregenerallysmall,withatight,nervouslook.Theyrangefromtheearly20stothemiddle40s,anditisusuallytheirnervesthatgofirst. Fearisthedriver'sconstantcompanion,andtragedycanbejustastepbehind.Scarcelyamaninthe500doesnotcarrythescarsofancientcrashes.Themarkoftheplasticsurgeonisevery-where,andburnedskiniscommon.Sometimesadriver'sscarsareinvisible,partofhisheritage.Twoyoungdrivers,BillyVukovichandGaryBettenhausen,racedintheirfirst500in1968.Lessthan20yearsbefore,theirfathersalsocompetedagainstoneanotherontheIndytrack--anddiedthere. Allthisthedriversaccept.Overtheyears,theyhavelearnedtotrusttheirowntechniques,reflexes,andcourage.Theydepend,too,onatrustedservant--scientificengineering.Thoughtheymaynothavehadagreatdealofschooling(anexceptionisNewZealand'sBruceMcLaren,whohasanengineeringdegree),manydriversaregiftedmechanics,withafeelingfortheirenginesthatamounttokinship. Afewtopdrivershavebecomeextremelywealthy,withsix-figureincomesfromprizemoney,endorsements,andjobswithauto-productmanufacturers.Somehavebusinessesoftheirown. McLarendesignsracingchassis(底盘).DanGurney'sCaliforniafactorymanufacturedthechassisofthreeofthefirstfourearsinthe1968Indy500,includinghisownsecondplacecar. Yetmoneyisnottheonlyreasonwhymenracecars.Perhapsitisn'teventhemajorreason. Three-timeIndywinner(1961,1964,1967) A.J.Foyt,forexample,canfrequentlybefoundcompetingondirtytracksinminor-leagueraces,wheremoney,crowdsandsafetyfeaturesarelimit-ed,andonlythedangerisnot.Whydoeshedoit7SometimesFoytanswers,"It'sinmyblood." Othertimeshesays,"Itisgoodpractice."Nowandthenhereplies,"Don'taskdumbquestions." Thestatement"itisusuallytheirnervesthatgofirst"means
A.at first they all have a nervous look B.they often find they can't bear the tension even if they are in good condition C.someday they find they can't make responses to any risk D.they can continue their career at most until the middle 40s正确答案B
