2011年雅思阅读模拟试题
<p> ★<span word="Suns">Suns</span> <span word="fickle">fickle</span> <span word="heart">heart</span> <span word="may">may</span> <span word="leave">leave</span> <span word="us">us</span> <span word="cold">cold</span></p><p> 25 <span word="January">January</span> 2007</p><p> <span word="From">From</span> <span word="New">New</span> <span word="Scientist">Scientist</span> <span word="Print">Print</span> <span word="Edition">Edition</span>.</p><p> <span word="Stuart">Stuart</span> <span word="Clark">Clark</span></p><p> 1.<span word="Theres">Theres</span> <span word="a">a</span> <span word="dimmer">dimmer</span> <span word="switch">switch</span> <span word="inside">inside</span> <span word="the">the</span> <span word="sun">sun</span> <span word="that">that</span> <span word="causes">causes</span> <span word="its">its</span> <span word="brightness">brightness</span> <span word="to">to</span> <span word="rise">rise</span> <span word="and">and</span> <span word="fall">fall</span> <span word="on">on</span> <span word="timescales">timescales</span> <span word="of">of</span> <span word="around">around</span> 100，000 <span word="years">years</span> - <span word="exactly">exactly</span> <span word="the">the</span> <span word="same">same</span> <span word="period">period</span> <span word="as">as</span> <span word="between">between</span> <span word="ice">ice</span> <span word="ages">ages</span> <span word="on">on</span> <span word="Earth">Earth</span>.<span word="So">So</span> <span word="says">says</span> <span word="a">a</span> <span word="physicist">physicist</span> <span word="who">who</span> <span word="has">has</span> <span word="created">created</span> <span word="a">a</span> <span word="computer">computer</span> <span word="model">model</span> <span word="of">of</span> <span word="our">our</span> <span word="stars">stars</span> <span word="core">core</span>.</p><p> 2.<span word="Robert">Robert</span> <span word="Ehrlich">Ehrlich</span> <span word="of">of</span> <span word="George">George</span> <span word="Mason">Mason</span> <span word="University">University</span> <span word="in">in</span> <span word="Fairfax">Fairfax</span>， <span word="Virginia">Virginia</span>， <span word="modelled">modelled</span> <span word="the">the</span> <span word="effect">effect</span> <span word="of">of</span> <span word="temperature">temperature</span> <span word="fluctuations">fluctuations</span> <span word="in">in</span> <span word="the">the</span> <span word="suns">suns</span> <span word="interior">interior</span>.<span word="According">According</span> <span word="to">to</span> <span word="the">the</span> <span word="standard">standard</span> <span word="view">view</span>， <span word="the">the</span> <span word="temperature">temperature</span> <span word="of">of</span> <span word="the">the</span> <span word="suns">suns</span> <span word="core">core</span> <span word="is">is</span> <span word="held">held</span> <span word="constant">constant</span> <span word="by">by</span> <span word="the">the</span> <span word="opposing">opposing</span> <span word="pressures">pressures</span> <span word="of">of</span> <span word="gravity">gravity</span> <span word="and">and</span> <span word="nuclear">nuclear</span> <span word="fusion">fusion</span>.<span word="However">However</span>， <span word="Ehrlich">Ehrlich</span> <span word="believed">believed</span> <span word="that">that</span> <span word="slight">slight</span> <span word="variations">variations</span> <span word="should">should</span> <span word="be">be</span> <span word="possible">possible</span>.</p><p> 3.<span word="He">He</span> <span word="took">took</span> <span word="as">as</span> <span word="his">his</span> <span word="starting">starting</span> <span word="point">point</span> <span word="the">the</span> <span word="work">work</span> <span word="of">of</span> <span word="Attila">Attila</span> <span word="Grandpierre">Grandpierre</span> <span word="of">of</span> <span word="the">the</span> <span word="Konkoly">Konkoly</span> <span word="Observatory">Observatory</span> <span word="of">of</span> <span word="the">the</span> <span word="Hungarian">Hungarian</span> <span word="Academy">Academy</span> <span word="of">of</span> <span word="Sciences">Sciences</span>.<span word="In">In</span> 2005， <span word="Grandpierre">Grandpierre</span> <span word="and">and</span> <span word="a">a</span> <span word="collaborator">collaborator</span>， <span word="Gbor">Gbor</span> <span word="goston">goston</span>， <span word="calculated">calculated</span> <span word="that">that</span> <span word="magnetic">magnetic</span> <span word="fields">fields</span> <span word="in">in</span> <span word="the">the</span> <span word="suns">suns</span> <span word="core">core</span> <span word="could">could</span> <span word="produce">produce</span> <span word="small">small</span> <span word="instabilities">instabilities</span> <span word="in">in</span> <span word="the">the</span> <span word="solar">solar</span> <span word="plasma">plasma</span>.<span word="These">These</span> <span word="instabilities">instabilities</span> <span word="would">would</span> <span word="induce">induce</span> <span word="localised">localised</span> <span word="oscillations">oscillations</span> <span word="in">in</span> <span word="temperature">temperature</span>.</p><p> 4.<span word="Ehrlichs">Ehrlichs</span> <span word="model">model</span> <span word="shows">shows</span> <span word="that">that</span> <span word="whilst">whilst</span> <span word="most">most</span> <span word="of">of</span> <span word="these">these</span> <span word="oscillations">oscillations</span> <span word="cancel">cancel</span> <span word="each">each</span> <span word="other">other</span> <span word="out">out</span>， <span word="some">some</span> <span word="reinforce">reinforce</span> <span word="one">one</span> <span word="another">another</span> <span word="and">and</span> <span word="become">become</span> <span word="long">long</span>-<span word="lived">lived</span> <span word="temperature">temperature</span> <span word="variations">variations</span>.<span word="The">The</span> <span word="favoured">favoured</span> <span word="frequencies">frequencies</span> <span word="allow">allow</span> <span word="the">the</span> <span word="suns">suns</span> <span word="core">core</span> <span word="temperature">temperature</span> <span word="to">to</span> <span word="oscillate">oscillate</span> <span word="around">around</span> <span word="its">its</span> <span word="average">average</span> <span word="temperature">temperature</span> <span word="of">of</span> 13.6 <span word="million">million</span> <span word="kelvin">kelvin</span> <span word="in">in</span> <span word="cycles">cycles</span> <span word="lasting">lasting</span> <span word="either">either</span> 100，000 <span word="or">or</span> 41，000 <span word="years">years</span>.<span word="Ehrlich">Ehrlich</span> <span word="says">says</span> <span word="that">that</span> <span word="random">random</span> <span word="interactions">interactions</span> <span word="within">within</span> <span word="the">the</span> <span word="suns">suns</span> <span word="magnetic">magnetic</span> <span word="field">field</span> <span word="could">could</span> <span word="flip">flip</span> <span word="the">the</span> <span word="fluctuations">fluctuations</span> <span word="from">from</span> <span word="one">one</span> <span word="cycle">cycle</span> <span word="length">length</span> <span word="to">to</span> <span word="the">the</span> <span word="other">other</span>.</p>
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