gre考试阅读真题解析(B)
<p> <span word="Although">Although</span> <span word="the">the</span> <span word="hormone">hormone</span> <span word="adrenaline">adrenaline</span> <span word="is">is</span> <span word="known">known</span> <span word="to">to</span> <span word="regulate">regulate</span> <span word="memory">memory</span> <span word="storage">storage</span>, <span word="it">it</span> <span word="does">does</span> <span word="not">not</span> <span word="pass">pass</span> <span word="from">from</span> <span word="the">the</span> <span word="blood">blood</span> <span word="into">into</span> <span word="brain">brain</span> <span word="cells">cells</span>. <span word="We">We</span> <span word="are">are</span> <span word="faced">faced</span> <span word="with">with</span> <span word="an">an</span> <span word="apparent">apparent</span> <span word="paradox">paradox</span>: <span word="how">how</span> <span word="can">can</span> <span word="a">a</span> <span word="hormone">hormone</span> <span word="that">that</span> <span word="does">does</span> <span word="not">not</span> <span word="act">act</span> <span word="directly">directly</span> <span word="on">on</span> <span word="the">the</span> <span word="brain">brain</span> <span word="have">have</span> <span word="such">such</span> <span word="a">a</span> <span word="large">large</span> <span word="effect">effect</span> <span word="on">on</span> <span word="brain">brain</span> <span word="function">function</span>?</p><p> <span word="Recently">Recently</span>, <span word="we">we</span> <span word="tested">tested</span> <span word="the">the</span> <span word="possibility">possibility</span> <span word="that">that</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="hormones">hormones</span> <span word="actions">actions</span> <span word="outside">outside</span> <span word="the">the</span> <span word="brain">brain</span> <span word="might">might</span> <span word="be">be</span> <span word="responsible">responsible</span>. <span word="Since">Since</span> <span word="one">one</span> <span word="consequence">consequence</span> <span word="of">of</span> <span word="adrenaline">adrenaline</span> <span word="release">release</span> <span word="in">in</span> <span word="an">an</span> <span word="animal">animal</span> <span word="is">is</span> <span word="an">an</span> <span word="increase">increase</span> <span word="in">in</span> <span word="blood">blood</span> <span word="glucose">glucose</span> <span word="levels">levels</span>, <span word="we">we</span> <span word="examined">examined</span> <span word="the">the</span> <span word="effects">effects</span> <span word="of">of</span> <span word="glucose">glucose</span> <span word="on">on</span> <span word="memory">memory</span> <span word="in">in</span> <span word="rats">rats</span>. <span word="We">We</span> <span word="found">found</span> <span word="that">that</span> <span word="glucose">glucose</span> <span word="injected">injected</span> <span word="immediately">immediately</span> <span word="after">after</span> <span word="training">training</span> <span word="enhances">enhances</span> <span word="memory">memory</span> <span word="tested">tested</span> <span word="the">the</span> <span word="next">next</span> <span word="day">day</span>. <span word="Additional">Additional</span> <span word="evidence">evidence</span> <span word="was">was</span> <span word="provided">provided</span> <span word="by">by</span> <span word="negative">negative</span> <span word="findings">findings</span>: <span word="drugs">drugs</span> <span word="called">called</span> <span word="adrenergic">adrenergic</span> <span word="antagonists">antagonists</span>, <span word="which">which</span> <span word="block">block</span> <span word="peripheral">peripheral</span> <span word="adrenaline">adrenaline</span> <span word="receptors">receptors</span>, <span word="disrupted">disrupted</span> <span word="adrenalines">adrenalines</span> <span word="ability">ability</span> <span word="to">to</span> <span word="regulate">regulate</span> <span word="memory">memory</span> <span word="but">but</span> <span word="did">did</span> <span word="not">not</span> <span word="affect">affect</span> <span word="memory">memory</span> <span word="enhancements">enhancements</span> <span word="produced">produced</span> <span word="by">by</span> <span word="glucose">glucose</span> <span word="that">that</span> <span word="was">was</span> <span word="not">not</span> <span word="stimulated">stimulated</span> <span word="by">by</span> <span word="adrenaline">adrenaline</span>. <span word="These">These</span> <span word="results">results</span> <span word="are">are</span> <span word="as">as</span> <span word="they">they</span> <span word="should">should</span> <span word="be">be</span> <span word="if">if</span> <span word="adrenaline">adrenaline</span> <span word="affects">affects</span> <span word="memory">memory</span> <span word="modulation">modulation</span> <span word="by">by</span> <span word="increasing">increasing</span> <span word="blood">blood</span> <span word="glucose">glucose</span> <span word="levels">levels</span>.</p><p> 17. <span word="The">The</span> <span word="primary">primary</span> <span word="purpose">purpose</span> <span word="of">of</span> <span word="the">the</span> <span word="passage">passage</span> <span word="is">is</span> <span word="to">to</span></p><p> <span word="reconcile">reconcile</span> <span word="two">two</span> <span word="opposing">opposing</span> <span word="theories">theories</span></p><p> <span word="compare">compare</span> <span word="two">two</span> <span word="different">different</span> <span word="explanations">explanations</span> <span word="for">for</span> <span word="a">a</span> <span word="phenomenon">phenomenon</span></p><p> <span word="describe">describe</span> <span word="experimental">experimental</span> <span word="research">research</span> <span word="that">that</span> <span word="appears">appears</span> <span word="to">to</span> <span word="support">support</span> <span word="an">an</span> <span word="unpopular">unpopular</span> <span word="theory">theory</span></p><p> <span word="present">present</span> <span word="evidence">evidence</span> <span word="that">that</span> <span word="may">may</span> <span word="help">help</span> <span word="to">to</span> <span word="resolve">resolve</span> <span word="an">an</span> <span word="apparent">apparent</span> <span word="contradiction">contradiction</span></p><p> <span word="describe">describe</span> <span word="a">a</span> <span word="hypothesis">hypothesis</span> <span word="that">that</span> <span word="has">has</span> <span word="cause">cause</span> <span word="a">a</span> <span word="controversy">controversy</span></p>
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