2011年最新六级阅读理解练习（26）
<p> <span word="You">You</span> <span word="stare">stare</span> <span word="at">at</span> <span word="waterfall">waterfall</span> <span word="for">for</span> <span word="a">a</span> <span word="minute">minute</span> <span word="or">or</span> <span word="two">two</span>, <span word="and">and</span> <span word="then">then</span> <span word="shift">shift</span> <span word="your">your</span> <span word="gaze">gaze</span> <span word="to">to</span> <span word="its">its</span> <span word="surroundings">surroundings</span>. <span word="What">What</span> <span word="you">you</span> <span word="now">now</span> <span word="see">see</span> <span word="appears">appears</span> <span word="to">to</span> <span word="drift">drift</span> <span word="upward">upward</span>.</p><p> <span word="These">These</span> <span word="optical">optical</span> <span word="illusions">illusions</span> <span word="occur">occur</span> <span word="because">because</span> <span word="the">the</span> <span word="brain">brain</span> <span word="is">is</span> <span word="constantly">constantly</span> <span word="matching">matching</span> <span word="its">its</span> <span word="model">model</span> <span word="of">of</span> <span word="reality">reality</span> <span word="to">to</span> <span word="signals">signals</span> <span word="from">from</span> <span word="the">the</span> <span word="bodys">bodys</span> <span word="sensors">sensors</span> <span word="and">and</span> <span word="interpreting">interpreting</span> <span word="what">what</span> <span word="must">must</span> <span word="be">be</span> <span word="happeningthat">happeningthat</span> <span word="your">your</span> <span word="brain">brain</span> <span word="must">must</span> <span word="have">have</span> <span word="moved">moved</span>, <span word="not">not</span> <span word="the">the</span> <span word="other">other</span>; <span word="that">that</span> <span word="downward">downward</span> <span word="motions">motions</span> <span word="is">is</span> <span word="now">now</span> <span word="normal">normal</span>, <span word="so">so</span> <span word="a">a</span> <span word="change">change</span> <span word="from">from</span> <span word="it">it</span> <span word="must">must</span> <span word="now">now</span> <span word="be">be</span> <span word="perceived">perceived</span> <span word="as">as</span> <span word="upward">upward</span> <span word="motion">motion</span>.</p><p> <span word="The">The</span> <span word="sensors">sensors</span> <span word="that">that</span> <span word="make">make</span> <span word="this">this</span> <span word="magic">magic</span> <span word="are">are</span> <span word="of">of</span> <span word="two">two</span> <span word="kinds">kinds</span>. <span word="Each">Each</span> <span word="eye">eye</span> <span word="contains">contains</span> <span word="about">about</span> 120 <span word="million">million</span> <span word="rods">rods</span>, <span word="which">which</span> <span word="provide">provide</span> <span word="somewhat">somewhat</span> <span word="blurry">blurry</span> <span word="black">black</span> <span word="and">and</span> <span word="white">white</span> <span word="vision">vision</span>. <span word="These">These</span> <span word="are">are</span> <span word="the">the</span> <span word="windows">windows</span> <span word="of">of</span> <span word="night">night</span> <span word="vision">vision</span>; <span word="once">once</span> <span word="adapted">adapted</span> <span word="to">to</span> <span word="the">the</span> <span word="dark">dark</span>, <span word="they">they</span> <span word="can">can</span> <span word="detect">detect</span> <span word="a">a</span> <span word="candle">candle</span> <span word="burning">burning</span> <span word="ten">ten</span> <span word="miles">miles</span> <span word="away">away</span>.</p><p> <span word="Color">Color</span> <span word="vision">vision</span> <span word="in">in</span> <span word="each">each</span> <span word="eye">eye</span> <span word="comes">comes</span> <span word="from">from</span> <span word="six">six</span> <span word="to">to</span> <span word="seven">seven</span> <span word="million">million</span> <span word="structures">structures</span> <span word="called">called</span> <span word="cones">cones</span>. <span word="Under">Under</span> <span word="ideal">ideal</span> <span word="conditions">conditions</span>, <span word="every">every</span> <span word="cone">cone</span> <span word="can">can</span> <span word="see">see</span> <span word="the">the</span> <span word="entire">entire</span> <span word="rainbow">rainbow</span> <span word="spectrum">spectrum</span> <span word="of">of</span> <span word="visible">visible</span> <span word="colors">colors</span>, <span word="but">but</span> <span word="one">one</span> <span word="type">type</span> <span word="of">of</span> <span word="cone">cone</span> <span word="is">is</span> <span word="most">most</span> <span word="sensitive">sensitive</span> <span word="to">to</span> <span word="red">red</span>, <span word="another">another</span> <span word="to">to</span> <span word="green">green</span>, <span word="a">a</span> <span word="third">third</span> <span word="to">to</span> <span word="blue">blue</span>.</p><p> <span word="Rods">Rods</span> <span word="and">and</span> <span word="cones">cones</span> <span word="send">send</span> <span word="their">their</span> <span word="messages">messages</span> <span word="pulsing">pulsing</span> <span word="an">an</span> <span word="average">average</span> 20 <span word="to">to</span> 25 <span word="times">times</span> <span word="per">per</span> <span word="second">second</span> <span word="along">along</span> <span word="the">the</span> <span word="optic">optic</span> <span word="nerve">nerve</span>. <span word="We">We</span> <span word="see">see</span> <span word="an">an</span> <span word="image">image</span> <span word="for">for</span> <span word="a">a</span> <span word="fraction">fraction</span> <span word="of">of</span> <span word="a">a</span> <span word="second">second</span> <span word="longer">longer</span> <span word="than">than</span> <span word="it">it</span> <span word="actually">actually</span> <span word="appears">appears</span>. <span word="In">In</span> <span word="movies">movies</span>, <span word="reels">reels</span> <span word="of">of</span> <span word="still">still</span> <span word="photographs">photographs</span> <span word="are">are</span> <span word="projected">projected</span> <span word="onto">onto</span> <span word="screens">screens</span> <span word="at">at</span> 24 <span word="frames">frames</span> <span word="per">per</span> <span word="second">second</span>, <span word="tricking">tricking</span> <span word="our">our</span> <span word="eyes">eyes</span> <span word="into">into</span> <span word="seeing">seeing</span> <span word="a">a</span> <span word="continuous">continuous</span> <span word="moving">moving</span> <span word="picture">picture</span>.</p><p> <span word="Like">Like</span> <span word="apparent">apparent</span> <span word="motion">motion</span>, <span word="color">color</span> <span word="vision">vision</span> <span word="is">is</span> <span word="also">also</span> <span word="subject">subject</span> <span word="to">to</span> <span word="unusual">unusual</span> <span word="effects">effects</span>. <span word="When">When</span> <span word="day">day</span> <span word="gives">gives</span> <span word="way">way</span> <span word="to">to</span> <span word="night">night</span>, <span word="twilight">twilight</span> <span word="brings">brings</span> <span word="what">what</span> <span word="the">the</span> <span word="poet">poet</span> <span word="T">T</span>.<span word="S">S</span>. <span word="Eliot">Eliot</span> <span word="called">called</span> <span word="the">the</span> <span word="violet">violet</span> <span word="hour">hour</span>. <span word="A">A</span> <span word="light">light</span> <span word="levels">levels</span> <span word="fall">fall</span>, <span word="the">the</span> <span word="rods">rods</span> <span word="become">become</span> <span word="progressively">progressively</span> <span word="less">less</span> <span word="responsive">responsive</span>. <span word="Rods">Rods</span> <span word="are">are</span> <span word="most">most</span> <span word="sensitive">sensitive</span> <span word="to">to</span> <span word="the">the</span> <span word="shorter">shorter</span> <span word="wavelengths">wavelengths</span> <span word="of">of</span> <span word="blue">blue</span> <span word="and">and</span> <span word="green">green</span>, <span word="and">and</span> <span word="they">they</span> <span word="impart">impart</span> <span word="a">a</span> <span word="strange">strange</span> <span word="vividness">vividness</span> <span word="to">to</span> <span word="the">the</span> <span word="gardens">gardens</span> <span word="blue">blue</span> <span word="flowers">flowers</span>.</p>
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