GRE阅读范文：magnet VS. shark
<p> <span word="During">During</span> <span word="experiments">experiments</span> <span word="at">at</span> <span word="the">the</span> <span word="Bimini">Bimini</span> <span word="Biological">Biological</span> <span word="Research">Research</span> <span word="Station">Station</span> <span word="in">in</span> <span word="the">the</span> <span word="Bahamas">Bahamas</span>, <span word="researchers">researchers</span> <span word="Eric">Eric</span> <span word="Stroud">Stroud</span> <span word="and">and</span> <span word="Michael">Michael</span> <span word="Hermann">Hermann</span> <span word="dropped">dropped</span> <span word="a">a</span> <span word="small">small</span> <span word="magnet">magnet</span> <span word="in">in</span> <span word="the">the</span> <span word="water">water</span> <span word="beside">beside</span> <span word="a">a</span> <span word="shark">shark</span>. <span word="The">The</span> <span word="presence">presence</span> <span word="of">of</span> <span word="the">the</span> <span word="magnet">magnet</span> <span word="elicited">elicited</span> <span word="a">a</span> <span word="distinct">distinct</span> <span word="reaction">reaction</span> <span word="from">from</span> <span word="the">the</span> <span word="fishthey">fishthey</span> <span word="darted">darted</span> <span word="away">away</span> <span word="from">from</span> <span word="it">it</span>.</p><p> <span word="Why">Why</span> <span word="the">the</span> <span word="intense">intense</span> <span word="reaction">reaction</span>? <span word="The">The</span> <span word="interaction">interaction</span> <span word="of">of</span> <span word="salt">salt</span> <span word="water">water</span> <span word="and">and</span> <span word="charged">charged</span> <span word="metals">metals</span> <span word="produces">produces</span> <span word="a">a</span> <span word="weak">weak</span> <span word="electrical">electrical</span> <span word="field">field</span>. <span word="When">When</span> <span word="a">a</span> <span word="shark">shark</span> <span word="comes">comes</span> <span word="close">close</span> <span word="to">to</span> <span word="that">that</span> <span word="field">field</span>, <span word="the">the</span> <span word="field">field</span> <span word="seems">seems</span> <span word="to">to</span> <span word="disrupt">disrupt</span> <span word="the">the</span> <span word="sharks">sharks</span> <span word="special">special</span> <span word="sixth">sixth</span> <span word="sense">sense</span>, <span word="electroreception">electroreception</span>. <span word="Many">Many</span> <span word="shark">shark</span> <span word="species">species</span> <span word="have">have</span> <span word="pores">pores</span> <span word="dotted">dotted</span> <span word="around">around</span> <span word="their">their</span> <span word="snouts">snouts</span> <span word="called">called</span> <span word="ampullae">ampullae</span> <span word="of">of</span> <span word="Lorenzinithat">Lorenzinithat</span> <span word="detect">detect</span> <span word="minute">minute</span> <span word="changes">changes</span> <span word="of">of</span> <span word="electricity">electricity</span> <span word="in">in</span> <span word="the">the</span> <span word="seawater">seawater</span>, <span word="up">up</span> <span word="to">to</span> <span word="one">one</span>-<span word="billionth">billionth</span> <span word="of">of</span> <span word="a">a</span> <span word="volt">volt</span>. <span word="These">These</span> <span word="electrical">electrical</span> <span word="impulses">impulses</span> <span word="come">come</span> <span word="from">from</span> <span word="the">the</span> <span word="tiniest">tiniest</span> <span word="muscle">muscle</span> <span word="contractions">contractions</span> <span word="of">of</span> <span word="other">other</span> <span word="aquatic">aquatic</span> <span word="life">life</span> <span word="formsor">formsor</span> <span word="peopleand">peopleand</span> <span word="are">are</span> <span word="carried">carried</span> <span word="through">through</span> <span word="the">the</span> <span word="ions">ions</span> <span word="in">in</span> <span word="the">the</span> <span word="salt">salt</span> <span word="water">water</span>.</p><p> <span word="What">What</span> <span word="does">does</span> <span word="salt">salt</span> <span word="water">water</span> <span word="have">have</span> <span word="to">to</span> <span word="do">do</span> <span word="with">with</span> <span word="electricity">electricity</span>? <span word="Salt">Salt</span> <span word="water">water</span> <span word="is">is</span> <span word="an">an</span> <span word="ionic">ionic</span> <span word="solution">solution</span>, <span word="meaning">meaning</span> <span word="it">it</span> <span word="contains">contains</span> <span word="particles">particles</span> <span word="with">with</span> <span word="unpaired">unpaired</span> <span word="electrons">electrons</span>. <span word="Because">Because</span> <span word="of">of</span> <span word="this">this</span> <span word="quality">quality</span>, <span word="salt">salt</span> <span word="water">water</span> <span word="can">can</span> <span word="also">also</span> <span word="act">act</span> <span word="as">as</span> <span word="an">an</span> <span word="electrical">electrical</span> <span word="conductor">conductor</span>. <span word="When">When</span> <span word="a">a</span> <span word="charged">charged</span> <span word="magnet">magnet</span> <span word="comes">comes</span> <span word="into">into</span> <span word="contact">contact</span> <span word="with">with</span> <span word="salt">salt</span> <span word="water">water</span>, <span word="the">the</span> <span word="ions">ions</span> <span word="flow">flow</span> <span word="through">through</span> <span word="the">the</span> <span word="metal">metal</span> <span word="to">to</span> <span word="become">become</span> <span word="stabilized">stabilized</span>, <span word="resulting">resulting</span> <span word="in">in</span> <span word="the">the</span> <span word="electrical">electrical</span> <span word="field">field</span>. <span word="We">We</span> <span word="know">know</span> <span word="that">that</span> <span word="sharks">sharks</span> <span word="can">can</span> <span word="sense">sense</span> <span word="shifts">shifts</span> <span word="in">in</span> <span word="the">the</span> <span word="surrounding">surrounding</span> <span word="underwater">underwater</span> <span word="electrical">electrical</span> <span word="fields">fields</span> <span word="through">through</span> <span word="their">their</span> <span word="ampullae">ampullae</span> <span word="of">of</span> <span word="Lorenzini">Lorenzini</span>. <span word="Running">Running</span> <span word="into">into</span> <span word="these">these</span> <span word="stronger">stronger</span> <span word="electric">electric</span> <span word="fields">fields</span> <span word="caused">caused</span> <span word="by">by</span> <span word="magnets">magnets</span> <span word="may">may</span> <span word="overwhelm">overwhelm</span> <span word="the">the</span> <span word="sense">sense</span> <span word="and">and</span> <span word="send">send</span> <span word="them">them</span> <span word="swimming">swimming</span> <span word="in">in</span> <span word="the">the</span> <span word="opposite">opposite</span> <span word="direction">direction</span>.</p>
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