2011年最新六级阅读理解练习（14）
<p> <span word="The">The</span> <span word="life">life</span> <span word="story">story</span> <span word="of">of</span> <span word="the">the</span> <span word="human">human</span> <span word="species">species</span> <span word="goes">goes</span> <span word="back">back</span> <span word="a">a</span> <span word="million">million</span> <span word="years">years</span>, <span word="and">and</span> <span word="there">there</span> <span word="is">is</span> <span word="no">no</span> <span word="doubt">doubt</span> <span word="that">that</span> <span word="man">man</span> <span word="came">came</span> <span word="only">only</span> <span word="recently">recently</span> <span word="to">to</span> <span word="the">the</span> <span word="western">western</span> <span word="hemisphere">hemisphere</span>. <span word="None">None</span> <span word="of">of</span> <span word="the">the</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="sites">sites</span> <span word="of">of</span> <span word="aboriginal">aboriginal</span> <span word="habitation">habitation</span> <span word="uncovered">uncovered</span> <span word="in">in</span> <span word="North">North</span> <span word="and">and</span> <span word="South">South</span> <span word="America">America</span> <span word="has">has</span> <span word="antiquity">antiquity</span> <span word="comparable">comparable</span> <span word="to">to</span> <span word="that">that</span> <span word="of">of</span> <span word="old">old</span> <span word="World">World</span> <span word="sites">sites</span>. <span word="Mans">Mans</span> <span word="occupation">occupation</span> <span word="of">of</span> <span word="the">the</span> <span word="New">New</span> <span word="World">World</span> <span word="may">may</span> <span word="date">date</span> <span word="several">several</span> <span word="tens">tens</span> <span word="of">of</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="years">years</span>, <span word="but">but</span> <span word="no">no</span> <span word="one">one</span> <span word="rationally">rationally</span> <span word="argues">argues</span> <span word="that">that</span> <span word="he">he</span> <span word="has">has</span> <span word="been">been</span> <span word="here">here</span> <span word="even">even</span> 100,000 <span word="years">years</span>.</p><p> <span word="Speculation">Speculation</span> <span word="as">as</span> <span word="to">to</span> <span word="how">how</span> <span word="man">man</span> <span word="found">found</span> <span word="his">his</span> <span word="way">way</span> <span word="to">to</span> <span word="America">America</span> <span word="was">was</span> <span word="lively">lively</span> <span word="at">at</span> <span word="the">the</span> <span word="outset">outset</span>, <span word="and">and</span> <span word="the">the</span> <span word="proposed">proposed</span> <span word="routes">routes</span> <span word="boxed">boxed</span> <span word="the">the</span> <span word="compass">compass</span>. <span word="With">With</span> <span word="one">one</span> <span word="or">or</span> <span word="two">two</span> <span word="notable">notable</span> <span word="exceptions">exceptions</span>, <span word="however">however</span>, <span word="students">students</span> <span word="of">of</span> <span word="American">American</span> <span word="anthropology">anthropology</span> <span word="soon">soon</span> <span word="settled">settled</span> <span word="for">for</span> <span word="the">the</span> <span word="plausible">plausible</span> <span word="idea">idea</span> <span word="that">that</span> <span word="the">the</span> <span word="first">first</span> <span word="immigrants">immigrants</span> <span word="came">came</span> <span word="b">b</span> <span word="way">way</span> <span word="of">of</span> <span word="a">a</span> <span word="land">land</span> <span word="bridge">bridge</span> <span word="that">that</span> <span word="had">had</span> <span word="connected">connected</span> <span word="the">the</span> <span word="northeast">northeast</span> <span word="comer">comer</span> <span word="of">of</span> <span word="Asia">Asia</span> <span word="to">to</span> <span word="the">the</span> <span word="northwest">northwest</span> <span word="corner">corner</span> <span word="of">of</span> <span word="North">North</span> <span word="America">America</span> <span word="across">across</span> <span word="the">the</span> <span word="Bering">Bering</span> <span word="Strait">Strait</span>. <span word="Mariners">Mariners</span> <span word="were">were</span> <span word="able">able</span> <span word="to">to</span> <span word="supply">supply</span> <span word="the">the</span> <span word="reassuring">reassuring</span> <span word="information">information</span> <span word="that">that</span> <span word="the">the</span> <span word="strait">strait</span> <span word="is">is</span> <span word="not">not</span> <span word="only">only</span> <span word="narrow">narrow</span><span word="it">it</span> <span word="is">is</span> 56 <span word="miles">miles</span> <span word="wide">wide</span><span word="but">but</span> <span word="also">also</span> <span word="shallow">shallow</span>, <span word="a">a</span> <span word="lowering">lowering</span> <span word="of">of</span> <span word="the">the</span> <span word="sea">sea</span> <span word="level">level</span> <span word="there">there</span> <span word="by">by</span> 100 <span word="feet">feet</span> <span word="or">or</span> <span word="so">so</span> <span word="would">would</span> <span word="transform">transform</span> <span word="the">the</span> <span word="strait">strait</span> <span word="into">into</span> <span word="an">an</span> <span word="isthmus">isthmus</span> . <span word="With">With</span> <span word="little">little</span> <span word="eels">eels</span> <span word="in">in</span> <span word="the">the</span> <span word="way">way</span> <span word="of">of</span> <span word="evidence">evidence</span> <span word="to">to</span> <span word="sustain">sustain</span> <span word="the">the</span> <span word="Bering">Bering</span> <span word="Strait">Strait</span> <span word="land">land</span> <span word="bridge">bridge</span>, <span word="anthropologists">anthropologists</span> <span word="embraced">embraced</span> <span word="the">the</span> <span word="idea">idea</span> <span word="that">that</span> <span word="man">man</span> <span word="walked">walked</span> <span word="dryshod">dryshod</span> <span word="from">from</span> <span word="Asia">Asia</span> <span word="to">to</span> <span word="America">America</span>.</p><p> <span word="Toward">Toward</span> <span word="the">the</span> <span word="end">end</span> <span word="of">of</span> <span word="the">the</span> <span word="last">last</span> <span word="century">century</span>, <span word="however">however</span>, <span word="it">it</span> <span word="became">became</span> <span word="apparent">apparent</span> <span word="that">that</span> <span word="the">the</span> <span word="Western">Western</span> <span word="Hemisphere">Hemisphere</span> <span word="was">was</span> <span word="the">the</span> <span word="New">New</span> <span word="World">World</span> <span word="not">not</span> <span word="only">only</span> <span word="for">for</span> <span word="man">man</span> <span word="but">but</span> <span word="also">also</span> <span word="for">for</span> <span word="a">a</span> <span word="host">host</span> <span word="of">of</span> <span word="animals">animals</span> <span word="and">and</span> <span word="plants">plants</span>. <span word="Zoologists">Zoologists</span> <span word="and">and</span> <span word="botanists">botanists</span> <span word="showed">showed</span> <span word="that">that</span> <span word="numerous">numerous</span> <span word="subjects">subjects</span> <span word="of">of</span> <span word="their">their</span> <span word="respective">respective</span> <span word="kingdoms">kingdoms</span> <span word="must">must</span> <span word="have">have</span> <span word="originated">originated</span> <span word="in">in</span> <span word="Asia">Asia</span> <span word="and">and</span> <span word="spread">spread</span> <span word="to">to</span> <span word="America">America</span>. <span word="These">These</span> <span word="findings">findings</span> <span word="were">were</span> <span word="neither">neither</span> <span word="astonishing">astonishing</span> <span word="nor">nor</span> <span word="wholly">wholly</span> <span word="unexpected">unexpected</span>. <span word="Such">Such</span> <span word="spread">spread</span> <span word="of">of</span> <span word="populations">populations</span> <span word="is">is</span> <span word="not">not</span> <span word="to">to</span> <span word="be">be</span> <span word="envisioned">envisioned</span> <span word="as">as</span> <span word="an">an</span> <span word="exodus">exodus</span> <span word="or">or</span> <span word="mass">mass</span> <span word="migration">migration</span>, <span word="even">even</span> <span word="in">in</span> <span word="the">the</span> <span word="case">case</span> <span word="of">of</span> <span word="animals">animals</span>. <span word="It">It</span> <span word="is">is</span>, <span word="rather">rather</span>, <span word="a">a</span> <span word="spilling">spilling</span> <span word="into">into</span> <span word="new">new</span> <span word="territory">territory</span> <span word="that">that</span> <span word="accompanies">accompanies</span> <span word="increase">increase</span> <span word="in">in</span> <span word="numbers">numbers</span>, <span word="with">with</span> <span word="movement">movement</span> <span word="in">in</span> <span word="the">the</span> <span word="direction">direction</span> <span word="of">of</span> <span word="least">least</span> <span word="population">population</span> <span word="pressure">pressure</span> <span word="and">and</span> <span word="most">most</span> <span word="favorable">favorable</span> <span word="ecological">ecological</span> <span word="conditions">conditions</span>. <span word="But">But</span> <span word="the">the</span> <span word="immense">immense</span> <span word="traffic">traffic</span> <span word="in">in</span> <span word="plant">plant</span> <span word="and">and</span> <span word="animals">animals</span> <span word="forms">forms</span> <span word="placed">placed</span> <span word="a">a</span> <span word="heavy">heavy</span> <span word="burden">burden</span> <span word="on">on</span> <span word="the">the</span> <span word="Bering">Bering</span> <span word="Strait">Strait</span> <span word="land">land</span> <span word="bridge">bridge</span> <span word="as">as</span> <span word="the">the</span> <span word="anthropologists">anthropologists</span> <span word="ahead">ahead</span> <span word="envisioned">envisioned</span> <span word="it">it</span>. <span word="Whereas">Whereas</span> <span word="purposeful">purposeful</span> <span word="men">men</span> <span word="could">could</span> <span word="make">make</span> <span word="their">their</span> <span word="way">way</span> <span word="across">across</span> <span word="a">a</span> <span word="narrow">narrow</span> <span word="bridge">bridge</span>, <span word="the">the</span> <span word="slow">slow</span> <span word="diffusion">diffusion</span> <span word="of">of</span> <span word="plant">plant</span> <span word="and">and</span> <span word="animals">animals</span> <span word="would">would</span> <span word="require">require</span> <span word="an">an</span> <span word="avenue">avenue</span> <span word="as">as</span> <span word="a">a</span> <span word="continent">continent</span> <span word="and">and</span> <span word="available">available</span> <span word="for">for</span> <span word="ages">ages</span> <span word="at">at</span> <span word="a">a</span> <span word="stretch">stretch</span>.</p>
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