2015职称英语理工类阅读理解文章及练习(五)
<p> <span word="its">its</span> <span word="a">a</span> <span word="strange">strange</span> <span word="partnership">partnership</span>,<span word="but">but</span> <span word="a">a</span> <span word="very">very</span> <span word="effective">effective</span> <span word="one">one</span>: <span word="satellites">satellites</span> <span word="and">and</span> <span word="space">space</span>-<span word="shuttle">shuttle</span>-<span word="carried">carried</span> <span word="radar">radar</span> <span word="are">are</span> <span word="helping">helping</span> <span word="archeologists">archeologists</span>.<span word="how">how</span>?<span word="byseeingthrough">byseeingthrough</span> <span word="sand">sand</span> <span word="or">or</span> <span word="through">through</span> <span word="treetops">treetops</span> <span word="to">to</span> <span word="locate">locate</span> <span word="important">important</span> <span word="archeological">archeological</span> <span word="sites">sites</span>.</p><p> <span word="take">take</span>,<span word="for">for</span> <span word="example">example</span>,<span word="the">the</span> <span word="second">second</span> 1981 <span word="flight">flight</span> <span word="of">of</span> <span word="the">the</span> <span word="space">space</span> <span word="shuttle">shuttle</span> <span word="challenger">challenger</span>.<span word="during">during</span> <span word="that">that</span> <span word="mission">mission</span>,<span word="a">a</span> <span word="powerful">powerful</span>,<span word="experimental">experimental</span> <span word="radar">radar</span> <span word="was">was</span> <span word="pointed">pointed</span> <span word="at">at</span> <span word="a">a</span> <span word="lifeless">lifeless</span> <span word="stretch">stretch</span> <span word="of">of</span> <span word="desert">desert</span> <span word="in">in</span> <span word="egypt">egypt</span> <span word="called">called</span> <span word="the">the</span> <span word="selima">selima</span> <span word="sand">sand</span> <span word="sheet">sheet</span>.<span word="to">to</span> <span word="everyones">everyones</span> <span word="surprise">surprise</span>,<span word="the">the</span> <span word="radar">radar</span> <span word="penetrated">penetrated</span> <span word="through">through</span> <span word="the">the</span> <span word="sand">sand</span> <span word="to">to</span> <span word="the">the</span> <span word="harder">harder</span> <span word="rock">rock</span> <span word="beneath">beneath</span>.<span word="on">on</span> <span word="the">the</span> <span word="surface">surface</span>,<span word="there">there</span> <span word="is">is</span> <span word="a">a</span> <span word="little">little</span> <span word="indication">indication</span> <span word="that">that</span> <span word="africas">africas</span> <span word="sahara">sahara</span> <span word="desert">desert</span> <span word="was">was</span> <span word="never">never</span> <span word="anything">anything</span> <span word="but">but</span> <span word="a">a</span> <span word="desert">desert</span>.<span word="when">when</span> <span word="the">the</span> <span word="archeologists">archeologists</span> <span word="studied">studied</span> <span word="the">the</span> <span word="radar">radar</span> <span word="images">images</span>,<span word="they">they</span> <span word="saw">saw</span> <span word="what">what</span> <span word="seemed">seemed</span> <span word="to">to</span> <span word="be">be</span> <span word="impossible">impossible</span>: <span word="there">there</span> <span word="was">was</span> <span word="sand">sand</span>-<span word="buried">buried</span> <span word="landscape">landscape</span> <span word="that">that</span> <span word="was">was</span> <span word="shaped">shaped</span> <span word="by">by</span> <span word="flowing">flowing</span> <span word="water">water</span>; <span word="traces">traces</span> <span word="of">of</span> <span word="ancient">ancient</span> <span word="riverbeds">riverbeds</span> <span word="appeared">appeared</span> <span word="to">to</span> <span word="be">be</span> <span word="over">over</span> <span word="nine">nine</span> <span word="miles">miles</span> <span word="wide">wide</span>,<span word="far">far</span> <span word="wider">wider</span> <span word="than">than</span> <span word="most">most</span> <span word="sections">sections</span> <span word="of">of</span> <span word="the">the</span> <span word="present">present</span>-<span word="day">day</span> <span word="nile">nile</span> <span word="river">river</span>.<span word="today">today</span>,<span word="the">the</span> <span word="area">area</span> <span word="is">is</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="hottest">hottest</span>,<span word="driest">driest</span> <span word="desert">desert</span> <span word="in">in</span> <span word="the">the</span> <span word="world">world</span>.</p><p> <span word="more">more</span> <span word="recently">recently</span>,<span word="landsat">landsat</span> 4,<span word="a">a</span> <span word="special">special</span> <span word="earth">earth</span>-<span word="mapping">mapping</span> <span word="satellite">satellite</span>,<span word="aided">aided</span> <span word="in">in</span> <span word="the">the</span> <span word="discovery">discovery</span> <span word="of">of</span> <span word="ancient">ancient</span> <span word="mayan">mayan</span> <span word="ruins">ruins</span> <span word="in">in</span> <span word="mexico">mexico</span>.<span word="landsat">landsat</span> <span word="can">can</span>,<span word="with">with</span> <span word="the">the</span> <span word="help">help</span> <span word="of">of</span> <span word="false">false</span>-<span word="color">color</span> <span word="imagery">imagery</span>,<span word="see">see</span> <span word="through">through</span> <span word="much">much</span> <span word="of">of</span> <span word="the">the</span> <span word="area">area</span>.<span word="armed">armed</span> <span word="with">with</span> <span word="these">these</span> <span word="maps">maps</span>,<span word="a">a</span> <span word="five">five</span>-<span word="person">person</span> <span word="expedition">expedition</span> <span word="took">took</span> <span word="to">to</span> <span word="the">the</span> <span word="air">air</span> <span word="in">in</span> <span word="a">a</span> <span word="helicopter">helicopter</span>.</p><p> </p>
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