2015年职称英语理工类教材新增内容阅读理解篇(3)
<p> <span word="Life">Life</span> <span word="Form">Form</span> <span word="Found">Found</span> <span word="on">on</span> <span word="Saturns">Saturns</span> <span word="Titan">Titan</span></p><p> <span word="Scientists">Scientists</span> <span word="say">say</span> <span word="they">they</span> <span word="have">have</span> <span word="discovered">discovered</span> <span word="hints">hints</span> <span word="of">of</span> <span word="alien">alien</span> <span word="life">life</span>1 <span word="on">on</span> <span word="the">the</span> <span word="Saturns">Saturns</span> <span word="moon">moon</span>2. <span word="The">The</span> <span word="discovery">discovery</span> <span word="of">of</span> <span word="a">a</span> <span word="sort">sort</span> <span word="of">of</span> <span word="life">life</span> <span word="was">was</span> <span word="announced">announced</span> <span word="after">after</span> <span word="researchers">researchers</span> <span word="at">at</span> <span word="the">the</span> <span word="US">US</span> <span word="space">space</span> <span word="agency">agency</span>,<span word="NASA">NASA</span>3,<span word="analyzed">analyzed</span> <span word="data">data</span> <span word="from">from</span> <span word="spacecraft">spacecraft</span> <span word="Cassini">Cassini</span>4,<span word="which">which</span> <span word="pointed">pointed</span> <span word="to">to</span>,<span word="the">the</span> <span word="existence">existence</span> <span word="of">of</span> <span word="methane">methane</span>-<span word="based">based</span> <span word="form">form</span> <span word="of">of</span> <span word="life">life</span> <span word="on">on</span> <span word="Saturns">Saturns</span> <span word="biggest">biggest</span> <span word="moon">moon</span>.</p><p> <span word="They">They</span> <span word="argue">argue</span> <span word="that">that</span> <span word="hydrogen">hydrogen</span> <span word="gets">gets</span> <span word="absorbed">absorbed</span> <span word="before">before</span> <span word="hitting">hitting</span> <span word="Titans">Titans</span> <span word="planet">planet</span>-<span word="like">like</span> <span word="surface">surface</span> <span word="covered">covered</span> <span word="with">with</span> <span word="methane">methane</span> <span word="lakes">lakes</span> <span word="and">and</span> <span word="rivers">rivers</span>. <span word="This">This</span>,<span word="they">they</span> <span word="say">say</span>,<span word="points">points</span> <span word="to">to</span> <span word="the">the</span> <span word="existence">existence</span> <span word="of">of</span> <span word="somebugs">somebugs</span>5 <span word="consuming">consuming</span> <span word="the">the</span> <span word="hydrogen">hydrogen</span> <span word="at">at</span> <span word="the">the</span> <span word="surface">surface</span> <span word="of">of</span> <span word="the">the</span> <span word="moon">moon</span> <span word="less">less</span> <span word="than">than</span> <span word="half">half</span> <span word="the">the</span> <span word="size">size</span> <span word="of">of</span> <span word="the">the</span> <span word="Earth">Earth</span>.</p><p> <span word="To">To</span> <span word="date">date</span>,<span word="scientists">scientists</span> <span word="have">have</span> <span word="not">not</span> <span word="yet">yet</span> <span word="detected">detected</span> <span word="this">this</span> <span word="form">form</span> <span word="of">of</span> <span word="life">life</span> <span word="anywhere">anywhere</span>,<span word="though">though</span> <span word="there">there</span> <span word="are">are</span> <span word="liquid">liquid</span>-<span word="water">water</span>-<span word="based">based</span> <span word="microorganisms">microorganisms</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="that">that</span> <span word="grow">grow</span> <span word="well">well</span> <span word="on">on</span> <span word="methane">methane</span> <span word="or">or</span> <span word="produce">produce</span> <span word="it">it</span> <span word="as">as</span> <span word="a">a</span> <span word="waste">waste</span> <span word="product">product</span>. <span word="On">On</span> <span word="Titan">Titan</span>, <span word="where">where</span> <span word="temperatures">temperatures</span> <span word="are">are</span> <span word="around">around</span> 90 <span word="Kelvin">Kelvin</span>6,<span word="a">a</span> <span word="methanebased">methanebased</span> <span word="organism">organism</span> <span word="would">would</span> <span word="have">have</span> <span word="to">to</span> <span word="use">use</span> <span word="a">a</span> <span word="substance">substance</span> <span word="that">that</span> <span word="is">is</span> <span word="liquid">liquid</span> <span word="as">as</span> <span word="its">its</span> <span word="medium">medium</span> <span word="for">for</span> <span word="living">living</span> <span word="processes">processes</span>, <span word="but">but</span> <span word="not">not</span> <span word="water">water</span> <span word="itself">itself</span>. <span word="Water">Water</span> <span word="is">is</span> <span word="frozen">frozen</span> <span word="solid">solid</span> <span word="on">on</span> <span word="Titans">Titans</span> <span word="surface">surface</span> <span word="and">and</span> <span word="much">much</span> <span word="too">too</span> <span word="cold">cold</span> <span word="to">to</span> <span word="support">support</span> <span word="life">life</span> <span word="as">as</span> <span word="we">we</span> <span word="know">know</span> <span word="it">it</span>.</p><p> <span word="The">The</span> <span word="absence">absence</span> <span word="of">of</span> <span word="detectable">detectable</span> <span word="acetylene">acetylene</span> <span word="on">on</span> <span word="the">the</span> <span word="Titans">Titans</span> <span word="surface">surface</span> <span word="can">can</span> <span word="very">very</span> <span word="well">well</span> <span word="have">have</span> <span word="a">a</span> <span word="non">non</span>-<span word="biological">biological</span> <span word="explanation">explanation</span>,<span word="said">said</span> <span word="Mark">Mark</span> <span word="Allen">Allen</span>,<span word="a">a</span> <span word="principal">principal</span> <span word="investigator">investigator</span>7 <span word="of">of</span> <span word="the">the</span> <span word="NASA">NASA</span> <span word="Titan">Titan</span> <span word="team">team</span>.</p><p> 词汇：</p><p> <span word="methane">methane</span> <span word="n">n</span>.甲烷，沼气</p><p> <span word="acetylene">acetylene</span> <span word="n">n</span>.乙炔</p><p> <span word="conservatism">conservatism</span> <span word="n">n</span>.保守主义,守旧</p>
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