题目内容：
根据以下材料，回答题Menhavetraveledeversincetheyfirstappearedontheearth．
InprimitivetimestheydidnottravelforpleasurebuttofindnewplaceSwheretheirherdscouldfeed，ortoescapefromhostileneighbors，ortofindmolefavorableclimates．Theytraveledonfoot．Theirjoumeyswerelong，tiring，andoftendangerous．Theyprotectedthemselveswithsimpleweapons，suchaswoodensticksoi-stoneclubs，andbylightingfiresatnightand，aboveall，bykeepingtogether．
Beingintelligentandcreative，theysoondiscoveredeasierwaysoftraveling．Theyrodeonthebacksoftheirdomesticatedanimals；theyhoHowedouttreetrunksand，byusingbitsofwoodaspaddles．wereabletotravelacrosswater．
Latertheytraveled，notfromnecessity，butforthejoyandexcitementofseeingandexperiencingnewthings．Thisisstillthemainreasonwhywetraveltoday.
Traveling，ofcourse，hasnowbecomeahighlyorganizedbusiness．Therearecarsandsplendidroads，expresstrains，hugeshipsandjetairliners，allofwhichprovideuswithcomfortsandsecurity．·r11lissoundswonderfm．Buttherearedifficulties．Ifyouwanttogoabroad，youneedapassportandavisa，ticket，luggage，andahundredofotherthings．Ifyouloseanyofthem，yourjourneymaybemined．
Inprimitivetimesmentraveled． A．forjoy
B．fromnecessity
C．tobroadenthemind
D．toescapefromthewildanimals
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答案解析：