雅思阅读文章3
<p>.<span word="h">h</span>1 {<span word="FONT">FONT</span>-<span word="WEIGHT">WEIGHT</span>: <span word="bold">bold</span>; <span word="TEXT">TEXT</span>-<span word="JUSTIFY">JUSTIFY</span>: <span word="inter">inter</span>-<span word="ideograph">ideograph</span>; <span word="FONT">FONT</span>-<span word="SIZE">SIZE</span>: 22<span word="pt">pt</span>; <span word="MARGIN">MARGIN</span>: 17<span word="pt">pt</span> 0<span word="cm">cm</span> 16.5<span word="pt">pt</span>; <span word="LINE">LINE</span>-<span word="HEIGHT">HEIGHT</span>: 240%; <span word="TEXT">TEXT</span>-<span word="ALIGN">ALIGN</span>: <span word="justify">justify</span>}.<span word="h">h</span>2 {<span word="FONT">FONT</span>-<span word="WEIGHT">WEIGHT</span>: <span word="bold">bold</span>; <span word="TEXT">TEXT</span>-<span word="JUSTIFY">JUSTIFY</span>: <span word="inter">inter</span>-<span word="ideograph">ideograph</span>; <span word="FONT">FONT</span>-<span word="SIZE">SIZE</span>: 16<span word="pt">pt</span>; <span word="MARGIN">MARGIN</span>: 13<span word="pt">pt</span> 0<span word="cm">cm</span>; <span word="LINE">LINE</span>-<span word="HEIGHT">HEIGHT</span>: 173%; <span word="TEXT">TEXT</span>-<span word="ALIGN">ALIGN</span>: <span word="justify">justify</span>}.<span word="h">h</span>3 {<span word="FONT">FONT</span>-<span word="WEIGHT">WEIGHT</span>: <span word="bold">bold</span>; <span word="TEXT">TEXT</span>-<span word="JUSTIFY">JUSTIFY</span>: <span word="inter">inter</span>-<span word="ideograph">ideograph</span>; <span word="FONT">FONT</span>-<span word="SIZE">SIZE</span>: 16<span word="pt">pt</span>; <span word="MARGIN">MARGIN</span>: 13<span word="pt">pt</span> 0<span word="cm">cm</span>; <span word="LINE">LINE</span>-<span word="HEIGHT">HEIGHT</span>: 173%; <span word="TEXT">TEXT</span>-<span word="ALIGN">ALIGN</span>: <span word="justify">justify</span>}</p><p> <span word="TRANSIT">TRANSIT</span> <span word="OF">OF</span> <span word="VENUS">VENUS</span></p><p> <span word="A">A</span> <span word="transit">transit</span> <span word="of">of</span> <span word="Venus">Venus</span> <span word="is">is</span> <span word="the">the</span> <span word="passage">passage</span> <span word="of">of</span> <span word="the">the</span> <span word="planet">planet</span> <span word="Venus">Venus</span> <span word="across">across</span> <span word="the">the</span> <span word="visible">visible</span> <span word="disc">disc</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span>, <span word="as">as</span> <span word="observed">observed</span> <span word="from">from</span> <span word="the">the</span> <span word="Earth">Earth</span>. <span word="Such">Such</span> <span word="events">events</span> <span word="are">are</span> <span word="rare">rare</span>, <span word="with">with</span> <span word="no">no</span> <span word="more">more</span> <span word="than">than</span> <span word="two">two</span> <span word="occurring">occurring</span> <span word="every">every</span> <span word="century">century</span>. <span word="The">The</span> <span word="most">most</span> <span word="recent">recent</span> <span word="transit">transit</span> <span word="of">of</span> <span word="Venus">Venus</span> <span word="occurred">occurred</span> <span word="on">on</span> 8 <span word="June">June</span> 2004, 122 <span word="years">years</span> <span word="after">after</span> <span word="the">the</span> <span word="previous">previous</span> <span word="transit">transit</span> <span word="was">was</span> <span word="observed">observed</span>. <span word="The">The</span> <span word="reason">reason</span> <span word="for">for</span> <span word="the">the</span> <span word="rarity">rarity</span> <span word="of">of</span> <span word="this">this</span> <span word="event">event</span> <span word="is">is</span> <span word="the">the</span> <span word="inclination">inclination</span> <span word="of">of</span> <span word="the">the</span> <span word="orbit">orbit</span> <span word="of">of</span> <span word="Venus">Venus</span> <span word="with">with</span> <span word="respect">respect</span> <span word="to">to</span> <span word="that">that</span> <span word="of">of</span> <span word="the">the</span> <span word="Earth">Earth</span>.</p><p> <span word="If">If</span> <span word="the">the</span> <span word="Venusian">Venusian</span> <span word="orbit">orbit</span> <span word="were">were</span> <span word="not">not</span> <span word="tilted">tilted</span> <span word="we">we</span> <span word="would">would</span> <span word="expect">expect</span> <span word="to">to</span> <span word="see">see</span> <span word="a">a</span> <span word="transit">transit</span> <span word="every">every</span> 584 <span word="days">days</span>. <span word="However">However</span>, <span word="due">due</span> <span word="to">to</span> <span word="the">the</span> <span word="relative">relative</span> <span word="tilt">tilt</span> <span word="of">of</span> <span word="the">the</span> <span word="orbits">orbits</span> <span word="of">of</span> <span word="Venus">Venus</span> <span word="and">and</span> <span word="Earth">Earth</span>, <span word="Venus">Venus</span> <span word="is">is</span> <span word="almost">almost</span> <span word="always">always</span> <span word="either">either</span> <span word="above">above</span> <span word="or">or</span> <span word="below">below</span> <span word="the">the</span> <span word="ecliptic">ecliptic</span> <span word="when">when</span> <span word="Venus">Venus</span> <span word="and">and</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="are">are</span> <span word="at">at</span> <span word="the">the</span> <span word="same">same</span> <span word="positions">positions</span> <span word="in">in</span> <span word="their">their</span> <span word="orbits">orbits</span>. <span word="Only">Only</span> <span word="when">when</span> <span word="Venus">Venus</span> <span word="and">and</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="lie">lie</span> <span word="close">close</span> <span word="to">to</span> <span word="the">the</span> <span word="line">line</span> <span word="of">of</span> <span word="nodes">nodes</span> <span word="indicated">indicated</span> <span word="in">in</span> <span word="the">the</span> <span word="diagram">diagram</span> <span word="above">above</span>, <span word="will">will</span> <span word="we">we</span> <span word="observe">observe</span> <span word="a">a</span> <span word="transit">transit</span>.</p><p> <span word="Transits">Transits</span> <span word="of">of</span> <span word="Venus">Venus</span> <span word="commonly">commonly</span> <span word="occur">occur</span> <span word="in">in</span> <span word="pairs">pairs</span> <span word="spaced">spaced</span> <span word="about">about</span> 8 <span word="years">years</span> <span word="apart">apart</span> <span word="which">which</span> <span word="correspond">correspond</span> <span word="to">to</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="nodes">nodes</span>. <span word="These">These</span> <span word="are">are</span> <span word="separated">separated</span> <span word="by">by</span> <span word="the">the</span> <span word="next">next</span> <span word="pair">pair</span> <span word="on">on</span> <span word="the">the</span> <span word="opposite">opposite</span> <span word="node">node</span> <span word="after">after</span> <span word="an">an</span> <span word="interval">interval</span> <span word="of">of</span> <span word="either">either</span> 105.5 <span word="or">or</span> 121.5 <span word="years">years</span>.</p>
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