英语六级考试冲刺练习阅读篇114
<p> <span word="Leonardo">Leonardo</span> <span word="da">da</span> <span word="Vinci">Vinci</span> <span word="was">was</span> <span word="the">the</span> <span word="first">first</span> <span word="man">man</span> <span word="to">to</span> <span word="suggest">suggest</span> <span word="that">that</span> <span word="growing">growing</span> <span word="trees">trees</span> <span word="add">add</span> <span word="a">a</span> <span word="new">new</span> <span word="ring">ring</span> <span word="in">in</span> <span word="their">their</span> <span word="trunks">trunks</span> <span word="each">each</span> <span word="year">year</span>. <span word="The">The</span> 11 <span word="in">in</span> <span word="these">these</span> <span word="rings">rings</span> <span word="relates">relates</span> <span word="to">to</span> <span word="the">the</span> <span word="physical">physical</span> <span word="conditions">conditions</span> <span word="which">which</span> <span word="the">the</span> <span word="tree">tree</span> <span word="experiences">experiences</span>. <span word="Thus">Thus</span>, <span word="trees">trees</span> <span word="grown">grown</span> <span word="in">in</span> <span word="a">a</span> 12 <span word="area">area</span> <span word="and">and</span> <span word="time">time</span> <span word="each">each</span> <span word="develop">develop</span> <span word="a">a</span> <span word="pattern">pattern</span> <span word="or">or</span> <span word="configuration">configuration</span> <span word="of">of</span> <span word="their">their</span> <span word="rings">rings</span>. <span word="This">This</span> 13 <span word="was">was</span> <span word="of">of</span> <span word="little">little</span> <span word="significance">significance</span> <span word="until">until</span> <span word="Andrew">Andrew</span> <span word="E">E</span>. <span word="Douglas">Douglas</span> <span word="began">began</span> <span word="to">to</span> <span word="study">study</span> <span word="tree">tree</span> <span word="rings">rings</span> <span word="in">in</span> <span word="Arizona">Arizona</span> <span word="in">in</span> 1900. <span word="Using">Using</span> <span word="a">a</span> <span word="technique">technique</span> <span word="called">called</span> <span word="cross">cross</span> <span word="dating">dating</span>, <span word="he">he</span> <span word="was">was</span> <span word="able">able</span> <span word="to">to</span> <span word="employ">employ</span> <span word="tree">tree</span> <span word="rings">rings</span> <span word="to">to</span> <span word="the">the</span> <span word="study">study</span> <span word="of">of</span> <span word="archaeological">archaeological</span> <span word="sites">sites</span> <span word="and">and</span> <span word="date">date</span> <span word="the">the</span> <span word="ruins">ruins</span> <span word="with">with</span> 14 . <span word="Some">Some</span> <span word="were">were</span> <span word="as">as</span> <span word="old">old</span> <span word="as">as</span> 6700 <span word="B">B</span>. <span word="C">C</span>. ! <span word="This">This</span> <span word="study">study</span> <span word="of">of</span> <span word="tree">tree</span> <span word="rings">rings</span> <span word="is">is</span> <span word="called">called</span> <span word="dendrochronology">dendrochronology</span>. <span word="In">In</span> <span word="time">time</span> <span word="the">the</span> <span word="cross">cross</span> <span word="dating">dating</span> <span word="was">was</span> 15 <span word="by">by</span> <span word="a">a</span> <span word="carbon">carbon</span> 14 <span word="process">process</span>. <span word="This">This</span> <span word="approach">approach</span> <span word="measured">measured</span> <span word="the">the</span> <span word="amount">amount</span> <span word="of">of</span> <span word="carbon">carbon</span> 14 <span word="radiating">radiating</span> <span word="from">from</span> <span word="a">a</span> <span word="piece">piece</span> <span word="of">of</span> <span word="wood">wood</span> <span word="and">and</span> 16 <span word="to">to</span> <span word="determine">determine</span> <span word="the">the</span> <span word="age">age</span> <span word="of">of</span> <span word="that">that</span> <span word="wood">wood</span>. <span word="Further">Further</span> <span word="use">use</span> <span word="of">of</span> <span word="the">the</span> <span word="carbon">carbon</span> 14 <span word="technique">technique</span> <span word="has">has</span> <span word="shown">shown</span> <span word="that">that</span> <span word="the">the</span> <span word="radiation">radiation</span> <span word="process">process</span> <span word="is">is</span> <span word="more">more</span> <span word="complex">complex</span> <span word="and">and</span> <span word="less">less</span> 17 <span word="than">than</span> <span word="had">had</span> <span word="been">been</span> <span word="at">at</span> <span word="first">first</span> <span word="thought">thought</span>. <span word="The">The</span> <span word="most">most</span> 18 <span word="aspect">aspect</span> <span word="of">of</span> <span word="tree">tree</span> <span word="ring">ring</span> <span word="research">research</span> <span word="is">is</span> <span word="now">now</span> <span word="calleddendroclimatology">calleddendroclimatology</span>. <span word="This">This</span> 19 <span word="of">of</span> <span word="the">the</span> <span word="reconstruction">reconstruction</span> <span word="of">of</span> <span word="climates">climates</span> <span word="and">and</span> <span word="climatic">climatic</span> <span word="cycles">cycles</span> <span word="and">and</span> <span word="events">events</span> <span word="from">from</span> <span word="the">the</span> <span word="evidence">evidence</span> <span word="found">found</span> <span word="in">in</span> <span word="the">the</span> <span word="tree">tree</span> <span word="rings">rings</span>. <span word="From">From</span> <span word="this">this</span> <span word="it">it</span> <span word="is">is</span> <span word="hoped">hoped</span> <span word="that">that</span> <span word="a">a</span> 20 <span word="of">of</span> <span word="drought">drought</span> <span word="cycles">cycles</span> <span word="can">can</span> <span word="be">be</span> <span word="determined">determined</span> <span word="in">in</span> <span word="the">the</span> <span word="American">American</span> <span word="Southwest">Southwest</span>. <span word="Such">Such</span> <span word="information">information</span> <span word="will">will</span> <span word="be">be</span> <span word="of">of</span> <span word="great">great</span> <span word="help">help</span> <span word="in">in</span> <span word="determining">determining</span> <span word="the">the</span> <span word="life">life</span> <span word="and">and</span> <span word="ecology">ecology</span> <span word="of">of</span> <span word="that">that</span> <span word="region">region</span> <span word="of">of</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span>. <span word="A">A</span>. <span word="thus">thus</span> <span word="B">B</span>. <span word="model">model</span> <span word="C">C</span>. <span word="variation">variation</span> <span word="D">D</span>. <span word="concept">concept</span> <span word="E">E</span>. <span word="accuracy">accuracy</span> <span word="F">F</span>. <span word="exciting">exciting</span> <span word="G">G</span>. <span word="consists">consists</span> <span word="H">H</span>. <span word="givenI">givenI</span>. <span word="proposition">proposition</span> <span word="J">J</span>. <span word="composes">composes</span> <span word="K">K</span>. <span word="further">further</span> <span word="L">L</span>. <span word="patternM">patternM</span>. <span word="supplemented">supplemented</span> <span word="N">N</span>. <span word="reliable">reliable</span> <span word="O">O</span>. <span word="excellent">excellent</span> <span word="II">II</span>. <span word="C">C</span> 12. <span word="H">H</span> 13. <span word="D">D</span> 14. <span word="E">E</span> 15. <span word="M">M</span> 16. <span word="A">A</span> 17. <span word="N">N</span> 18. <span word="F">F</span> 19. <span word="G">G</span> 20. <span word="L">L</span>1 </p>
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