2014年职称英语理工类阅读理解练习(4)
<p> <span word="Invisibility">Invisibility</span> <span word="Ring">Ring</span></p><p> <span word="Scientists">Scientists</span> <span word="cant">cant</span> <span word="yet">yet</span> <span word="make">make</span> <span word="an">an</span> <span word="invisibility">invisibility</span> <span word="cloak">cloak</span>1 <span word="like">like</span> <span word="the">the</span> <span word="one">one</span> <span word="that">that</span> <span word="Harry">Harry</span> <span word="Potter">Potter</span>2 <span word="uses">uses</span>.<span word="But">But</span>，<span word="for">for</span> <span word="the">the</span> <span word="first">first</span> <span word="time">time</span>，<span word="theyve">theyve</span> <span word="constructed">constructed</span> <span word="a">a</span> <span word="simple">simple</span> <span word="cloaking">cloaking</span> <span word="device">device</span> <span word="that">that</span> <span word="makes">makes</span> <span word="itself">itself</span> <span word="and">and</span> <span word="somethingplaced">somethingplaced</span> <span word="inside">inside</span> <span word="it">it</span> <span word="invisible">invisible</span> <span word="to">to</span> <span word="microwaves">microwaves</span>.</p><p> <span word="When">When</span> <span word="a">a</span> <span word="person">person</span> <span word="sees">sees</span> <span word="an">an</span> <span word="object">object</span>，<span word="his">his</span> <span word="or">or</span> <span word="her">her</span> <span word="eye">eye</span> <span word="senses">senses</span> <span word="many">many</span> <span word="different">different</span> <span word="waves">waves</span> <span word="of">of</span> <span word="visiblelight">visiblelight</span> <span word="as">as</span> <span word="they">they</span> <span word="bounce">bounce</span> <span word="off">off</span> <span word="the">the</span> <span word="object">object</span>.<span word="The">The</span> <span word="eye">eye</span> <span word="and">and</span> <span word="brain">brain</span> <span word="then">then</span> <span word="work">work</span> <span word="together">together</span> <span word="to">to</span> <span word="organize">organize</span> <span word="thesesensations">thesesensations</span> <span word="and">and</span> <span word="reconstruct">reconstruct</span> <span word="the">the</span> <span word="objects">objects</span> <span word="original">original</span> <span word="shape">shape</span>. <span word="So">So</span>，<span word="to">to</span> <span word="make">make</span> <span word="an">an</span> <span word="object">object</span> <span word="invisible">invisible</span>，<span word="scientists">scientists</span> <span word="have">have</span> <span word="to">to</span> <span word="keep">keep</span> <span word="waves">waves</span> <span word="from">from</span> <span word="bouncing">bouncing</span> <span word="off">off</span> <span word="it">it</span>.<span word="And">And</span> <span word="they">they</span> <span word="have">have</span> <span word="to">to</span> <span word="make">make</span> <span word="sure">sure</span> <span word="the">the</span> <span word="objectcasts">objectcasts</span> <span word="no">no</span> <span word="shadow">shadow</span>.<span word="Otherwise">Otherwise</span>，<span word="the">the</span> <span word="absence">absence</span> <span word="of">of</span> <span word="reflected">reflected</span> <span word="light">light</span> <span word="on">on</span> <span word="one">one</span> <span word="side">side</span> <span word="would">would</span> <span word="give">give</span> <span word="the">the</span> <span word="obiectaway">obiectaway</span>.</p><p> <span word="Invisibility">Invisibility</span> <span word="isnt">isnt</span> <span word="possible">possible</span> <span word="yet">yet</span> <span word="with">with</span> <span word="waves">waves</span> <span word="of">of</span> <span word="light">light</span> <span word="that">that</span> <span word="the">the</span> <span word="human">human</span> <span word="eye">eye</span> <span word="can">can</span> <span word="see">see</span>.<span word="But">But</span> <span word="it">it</span> <span word="is">is</span> <span word="nowpossible">nowpossible</span> <span word="with">with</span> <span word="microwaves">microwaves</span>.<span word="Like">Like</span> <span word="visible">visible</span> <span word="light">light</span>，<span word="microwaves">microwaves</span> <span word="are">are</span> <span word="a">a</span> <span word="form">form</span> <span word="of">of</span> <span word="radiant">radiant</span> <span word="energy">energy</span>.<span word="Theyare">Theyare</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="electromagnetic">electromagnetic</span> <span word="spectrum">spectrum</span>，<span word="which">which</span> <span word="also">also</span> <span word="includes">includes</span> <span word="radio">radio</span> <span word="waves">waves</span>，<span word="infrared">infrared</span> <span word="light">light</span>，<span word="ultraviolet">ultraviolet</span> <span word="rays">rays</span>，<span word="X">X</span> <span word="rays">rays</span>，<span word="and">and</span> <span word="gamma">gamma</span> <span word="rays">rays</span>.<span word="The">The</span> <span word="wavelengths">wavelengths</span> <span word="of">of</span> <span word="microwaves">microwaves</span> <span word="are">are</span> <span word="shorter">shorter</span> <span word="thanthose">thanthose</span> <span word="of">of</span> <span word="radio">radio</span> <span word="waves">waves</span> <span word="but">but</span> <span word="longer">longer</span> <span word="than">than</span> <span word="those">those</span> <span word="of">of</span> <span word="visible">visible</span> <span word="light">light</span>.</p><p> <span word="The">The</span> <span word="scientists">scientists</span> <span word="new">new</span> <span word="invisibility">invisibility</span> <span word="device">device</span> <span word="is">is</span> <span word="the">the</span> <span word="size">size</span> <span word="of">of</span> <span word="a">a</span> <span word="drink">drink</span> <span word="coaster">coaster</span> <span word="and">and</span> <span word="shaped">shaped</span> <span word="like">like</span> <span word="aring">aring</span>.<span word="The">The</span> <span word="ring">ring</span> <span word="is">is</span> <span word="made">made</span> <span word="of">of</span> <span word="a">a</span> <span word="special">special</span> <span word="material">material</span> <span word="with">with</span> <span word="unusual">unusual</span> <span word="ability">ability</span>.<span word="When">When</span> <span word="microwaves">microwaves</span> <span word="strike">strike</span> <span word="thering">thering</span>，<span word="very">very</span> <span word="few">few</span> <span word="bounce">bounce</span> <span word="off">off</span> <span word="it">it</span>.<span word="Instead">Instead</span>，<span word="they">they</span> <span word="pass">pass</span> <span word="through">through</span> <span word="the">the</span> <span word="ring">ring</span>，<span word="which">which</span> <span word="bends">bends</span> <span word="the">the</span> <span word="waves">waves</span> <span word="allthe">allthe</span> <span word="way">way</span> <span word="around">around</span> <span word="until">until</span> <span word="they">they</span> <span word="reach">reach</span> <span word="the">the</span> <span word="opposite">opposite</span> <span word="side">side</span>.<span word="The">The</span> <span word="waves">waves</span> <span word="then">then</span> <span word="return">return</span> <span word="to">to</span> <span word="their">their</span> <span word="originalpaths">originalpaths</span>.</p>
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