题目内容：
Questionsarebasedonthefollowingpassage:
Sportsandgamesmakeourbodiesstrong,preventusfromgettingtoofat,andkeepushealthy．Butthesearenottheironlyuse．Theygiveusvaluablepracticeinmakingeyes,brainandmusclesworktogether．Intennis,oureyesseetheballcoming,judgeitsspeedanddirectionandpassthisinformationontothebrain．Thebrainthenhastodecidewhattodo,andtosenditsorderstothemusclesofthearms,legs,andsoon,sothattheballismetandhitbackwhereitoughttogo．Allthismusthappenwithverygreatspeed,andonlythosewhohavehadalotofpracticeattenniscancarryoutthiscomplicatedchainofeventssuccessfully．Forthosewhoworkwiththeirbrainsmostoftheday,thepracticeofsuchskillsisespeciallyuseful．
Sportsandgamesarealsoveryusefulforcharacter-training．Intheirlessonsatschool,boysandgirlsmaylearnaboutsuchvirtuesasunselfishness,courage,disciplineandloveofone'scountry;butwhatislearnedinbookscannothavethesamedeepeffectonachild'scharacteraswhatislearnedbyexperience．
Theordinaryday-schoolcannotgivemuchpracticaltraininginliving,becausemostofthepupils'timeisspentinclasses,studyinglessons．Soitiswhatthepupilsdointheirsparetimethatreallypreparesthemtotaketheirplaceinsocietyascitizenswhentheygrowup．Ifeachofthemlearnstoworkforhisteamandnotforhimselfonthefootballfield,hewilllaterfinditnaturaltoworkforthegoodofhiscountryinsteadofonlyforhisownbenefit．
Whenweplaytenniswehaveto（ ）． A．use,first,oureyes,thenthebrainandfinallythemuscles
B．makeoureyes,brainandmusclesworkalmostatthesametime
C．usemainlymearmsandlegstohit
D．usemainlythemusclessothattheballismetandhitback
参考答案：
答案解析：