2015职称英语考试真题及答案解析：理工A阅读判断
<p> 2015年全国职称英语考试于3月28日(9：00-11：00)举行。针对考后考生最关注的2015职称英语考试真题及答案解析问题，英语网在考后第一时间为您整理发布2015职称英语考试真题及答案解析：理工类。预祝各位考生顺利通过2015职称英语考试!</p><p><span word="Lackof">Lackof</span> <span word="Oxygen">Oxygen</span> <span word="Delayed">Delayed</span> <span word="the">the</span> <span word="Rise">Rise</span> <span word="of">of</span> <span word="Animals">Animals</span> <span word="on">on</span> <span word="Earth">Earth</span> </p><p><span word="Scientistshave">Scientistshave</span> <span word="long">long</span> <span word="speculated">speculated</span> <span word="as">as</span> <span word="to">to</span> <span word="why">why</span> <span word="animal">animal</span> <span word="species">species</span> <span word="didnt">didnt</span> <span word="flourish">flourish</span> <span word="sooner">sooner</span>,<span word="oncesufficient">oncesufficient</span> <span word="oxygen">oxygen</span> <span word="covered">covered</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="surface">surface</span>.<span word="Animals">Animals</span> <span word="began">began</span> <span word="to">to</span> <span word="prosper">prosper</span> <span word="at">at</span> <span word="theend">theend</span> <span word="of">of</span> <span word="the">the</span> <span word="Proterozoic">Proterozoic</span> <span word="period">period</span>,<span word="about">about</span> 800 <span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span><span word="but">but</span> <span word="what">what</span> <span word="about">about</span> <span word="thebillion">thebillion</span>-<span word="year">year</span> <span word="stretch">stretch</span> <span word="before">before</span> <span word="that">that</span>,<span word="when">when</span> <span word="most">most</span> <span word="researchers">researchers</span> <span word="think">think</span> <span word="there">there</span> <span word="also">also</span> <span word="wasplenty">wasplenty</span> <span word="of">of</span> <span word="oxygen">oxygen</span>？</p><p><span word="Well">Well</span>,<span word="it">it</span> <span word="seems">seems</span> <span word="the">the</span> <span word="air">air</span> <span word="wasnt">wasnt</span> <span word="so">so</span> <span word="great">great</span> <span word="then">then</span>,<span word="after">after</span> <span word="all">all</span>.</p><p><span word="Ina">Ina</span> <span word="study">study</span> <span word="published">published</span> <span word="Oct">Oct</span>.31 <span word="in">in</span> <span word="Science">Science</span>,<span word="Yale">Yale</span> <span word="researcher">researcher</span> <span word="Noah">Noah</span> <span word="Planavsky">Planavsky</span> <span word="and">and</span> <span word="hiscolleagues">hiscolleagues</span> <span word="found">found</span> <span word="that">that</span> <span word="oxygen">oxygen</span> <span word="levels">levels</span> <span word="during">during</span> <span word="the">the</span> <span word="boring">boring</span> <span word="billionperiod">billionperiod</span> <span word="wereonly">wereonly</span> 0.1% <span word="of">of</span> <span word="what">what</span> <span word="they">they</span> <span word="are">are</span> <span word="today">today</span>.<span word="In">In</span> <span word="other">other</span> <span word="words">words</span>,<span word="Earths">Earths</span> <span word="atmosphere">atmosphere</span> <span word="couldnthave">couldnthave</span> <span word="supported">supported</span> <span word="a">a</span> <span word="diversity">diversity</span> <span word="of">of</span> <span word="creatures">creatures</span>,<span word="no">no</span> <span word="matter">matter</span> <span word="what">what</span> <span word="genetic">genetic</span> <span word="advancementswere">advancementswere</span> <span word="poised">poised</span> <span word="to">to</span> <span word="occur">occur</span>.</p><p><span word="There">There</span> <span word="is">is</span> <span word="no">no</span> <span word="questionthat">questionthat</span> <span word="genetic">genetic</span> <span word="and">and</span> <span word="ecological">ecological</span> <span word="innovation">innovation</span> <span word="must">must</span> <span word="ultimately">ultimately</span> <span word="be">be</span> <span word="behind">behind</span> <span word="the">the</span> <span word="rise">rise</span> <span word="ofanimals">ofanimals</span>,<span word="but">but</span> <span word="it">it</span> <span word="is">is</span> <span word="equally">equally</span> <span word="unavoidable">unavoidable</span> <span word="that">that</span> <span word="animals">animals</span> <span word="need">need</span> <span word="a">a</span> <span word="certain">certain</span> <span word="level">level</span> <span word="ofoxygen">ofoxygen</span>,<span word="said">said</span> <span word="Planavsky">Planavsky</span>,<span word="co">co</span>-<span word="lead">lead</span> <span word="author">author</span> <span word="of">of</span> <span word="the">the</span> <span word="research">research</span> <span word="along">along</span> <span word="with">with</span> <span word="ChristopherReinhard">ChristopherReinhard</span> <span word="of">of</span> <span word="the">the</span> <span word="Georgia">Georgia</span> <span word="Institute">Institute</span> <span word="of">of</span> <span word="Technology">Technology</span>.<span word="Were">Were</span> <span word="providing">providing</span> <span word="the">the</span> <span word="firstevidence">firstevidence</span> <span word="that">that</span> <span word="oxygen">oxygen</span> <span word="levels">levels</span> <span word="were">were</span> <span word="low">low</span> <span word="enough">enough</span> <span word="during">during</span> <span word="this">this</span> <span word="period">period</span> <span word="to">to</span> <span word="potentiallyprevent">potentiallyprevent</span> <span word="the">the</span> <span word="rise">rise</span> <span word="of">of</span> <span word="animals">animals</span>.</p>
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