六级考试阅读理解真题精选练习（20）
<p> <span word="For">For</span> <span word="centuries">centuries</span>, <span word="explorers">explorers</span> <span word="have">have</span> <span word="risked">risked</span> <span word="their">their</span> <span word="lives">lives</span> <span word="venturing">venturing</span> <span word="into">into</span> <span word="the">the</span> <span word="unknown">unknown</span> <span word="for">for</span> <span word="reasons">reasons</span> <span word="that">that</span> <span word="were">were</span> <span word="to">to</span> <span word="varying">varying</span> <span word="degrees">degrees</span> <span word="economic">economic</span> <span word="and">and</span> <span word="nationalistic">nationalistic</span>. <span word="Columbus">Columbus</span> <span word="went">went</span> <span word="west">west</span> <span word="to">to</span> <span word="look">look</span> <span word="for">for</span> <span word="better">better</span> <span word="trade">trade</span> <span word="routes">routes</span> <span word="to">to</span> <span word="the">the</span> <span word="Orient">Orient</span> <span word="and">and</span> <span word="to">to</span> <span word="promote">promote</span> <span word="the">the</span> <span word="greater">greater</span> <span word="glory">glory</span> <span word="of">of</span> <span word="Spain">Spain</span>. <span word="Lewis">Lewis</span> <span word="and">and</span> <span word="Clark">Clark</span> <span word="journeyed">journeyed</span> <span word="into">into</span> <span word="the">the</span> <span word="American">American</span> <span word="wilderness">wilderness</span> <span word="to">to</span> <span word="find">find</span> <span word="out">out</span> <span word="what">what</span> <span word="the">the</span> <span word="U">U</span>.<span word="S">S</span>. <span word="had">had</span> <span word="acquired">acquired</span> <span word="when">when</span> <span word="it">it</span> <span word="purchased">purchased</span> <span word="Louisiana">Louisiana</span>, <span word="and">and</span> <span word="the">the</span> <span word="Appolo">Appolo</span> <span word="astronauts">astronauts</span> <span word="rocketed">rocketed</span> <span word="to">to</span> <span word="the">the</span> <span word="moon">moon</span> <span word="in">in</span> <span word="a">a</span> <span word="dramatic">dramatic</span> <span word="show">show</span> <span word="of">of</span> <span word="technological">technological</span> <span word="muscle">muscle</span> <span word="during">during</span> <span word="the">the</span> <span word="cold">cold</span> <span word="war">war</span>.</p><p> <span word="Although">Although</span> <span word="their">their</span> <span word="missions">missions</span> <span word="blended">blended</span> <span word="commercial">commercial</span> <span word="and">and</span> <span word="political">political</span>-<span word="military">military</span> <span word="imperatives">imperatives</span>, <span word="the">the</span> <span word="explorers">explorers</span> <span word="involved">involved</span> <span word="all">all</span> <span word="accomplished">accomplished</span> <span word="some">some</span> <span word="significant">significant</span> <span word="science">science</span> <span word="simply">simply</span> <span word="by">by</span> <span word="going">going</span> <span word="where">where</span> <span word="no">no</span> <span word="scientists">scientists</span> <span word="had">had</span> <span word="gone">gone</span> <span word="before">before</span>.</p><p> <span word="Today">Today</span> <span word="Mars">Mars</span> <span word="looms">looms</span> <span word="as">as</span> <span word="humanitys">humanitys</span> <span word="next">next</span> <span word="great">great</span> <span word="terra">terra</span> <span word="incognita">incognita</span>. <span word="And">And</span> <span word="with">with</span> <span word="doubtful">doubtful</span> <span word="prospects">prospects</span> <span word="for">for</span> <span word="a">a</span> <span word="short">short</span>-<span word="term">term</span> <span word="financial">financial</span> <span word="return">return</span>, <span word="with">with</span> <span word="the">the</span> <span word="cold">cold</span> <span word="war">war</span> <span word="a">a</span> <span word="rapidly">rapidly</span> <span word="fading">fading</span> <span word="memory">memory</span> <span word="and">and</span> <span word="amid">amid</span> <span word="a">a</span> <span word="growing">growing</span> <span word="emphasis">emphasis</span> <span word="on">on</span> <span word="international">international</span> <span word="cooperation">cooperation</span> <span word="in">in</span> <span word="large">large</span> <span word="space">space</span> <span word="ventures">ventures</span>, <span word="it">it</span> <span word="is">is</span> <span word="clear">clear</span> <span word="that">that</span> <span word="imperatives">imperatives</span> <span word="other">other</span> <span word="than">than</span> <span word="profits">profits</span> <span word="or">or</span> <span word="nationalism">nationalism</span> <span word="will">will</span> <span word="have">have</span> <span word="to">to</span> <span word="compel">compel</span> <span word="human">human</span> <span word="beings">beings</span> <span word="to">to</span> <span word="leave">leave</span> <span word="their">their</span> <span word="tracks">tracks</span> <span word="on">on</span> <span word="the">the</span> <span word="planets">planets</span> <span word="reddish">reddish</span> <span word="surface">surface</span>. <span word="Could">Could</span> <span word="it">it</span> <span word="be">be</span> <span word="that">that</span> <span word="science">science</span>, <span word="which">which</span> <span word="has">has</span> <span word="long">long</span> <span word="played">played</span> <span word="a">a</span> <span word="minor">minor</span> <span word="role">role</span> <span word="in">in</span> <span word="exploration">exploration</span>, <span word="is">is</span> <span word="at">at</span> <span word="last">last</span> <span word="destined">destined</span> <span word="to">to</span> <span word="take">take</span> <span word="a">a</span> <span word="leading">leading</span> <span word="role">role</span>? <span word="The">The</span> <span word="question">question</span> <span word="naturally">naturally</span> <span word="invites">invites</span> <span word="a">a</span> <span word="couple">couple</span> <span word="of">of</span> <span word="others">others</span>: <span word="Are">Are</span> <span word="there">there</span> <span word="experiments">experiments</span> <span word="that">that</span> <span word="only">only</span> <span word="humans">humans</span> <span word="could">could</span> <span word="do">do</span> <span word="on">on</span> <span word="Mars">Mars</span>? <span word="Could">Could</span> <span word="those">those</span> <span word="experiments">experiments</span> <span word="provide">provide</span> <span word="insights">insights</span> <span word="profound">profound</span> <span word="enough">enough</span> <span word="to">to</span> <span word="justify">justify</span> <span word="the">the</span> <span word="expense">expense</span> <span word="of">of</span> <span word="sending">sending</span> <span word="people">people</span> <span word="across">across</span> <span word="interplanetary">interplanetary</span> <span word="space">space</span>?</p>
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