新概念第四册课文[新概念第四册课文翻译及学习笔记【Lesson43、44、45】].pdfVIP

新概念第四册课文[新概念第四册课文翻译及学习笔记

【Lesson43、44、45】]

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第四册课文翻译及学习笔记，希望为大家的新概念英语学习提供帮

助!

Firstlistenandthenanswerthefollowingquestion.

withotherintelligentbeingsinspacedependon?

Wemustconcludefromtheworkofthosewhohavestudied

theoriginoflife,thatgivenaplaonlyapproximatelylike

ourown,lifeisalmostcertaintostart.Ofalltheplasin

oursolarsystem,wewarenowprettycertaintheEarthisthe

onlyoneonwhichlifecansurvive.Marsistoodryandpoor

inoxygen,Venusfartoohot,andsoisMercury,andtheouter

plashavetemperaturesnearabsolutezeroand

hydrogen-dominatedatmospheres.Butothersuns,startasthe

astronomerscallthem,areboundtohaveplaslikeourown,and

asisthenumberofstarsintheuniverseissovast,this

possibilitybeesvirtualcertainty.Thereareonehundred

thousandmillionstartsinourownMilkyWayalone,andthen

therearethreethousandmillionotherMilkyWays,orgalaxies,

intheuniverse.Sothenumberofthestarsthatweknowexist

isnowestimatedatabout300millionmillionmillion.

Althoughperhapsonly1percentofthelifethathas

startedsomewherewilldevelopintohighlyplexandintelligent

patterns,sovastisthenumberofplas,thatintelligentlife

isboundtobeanaturalpartoftheuniverse.

Ifthenwearesocertainthatotherintelligentlife

existsintheuniverse,whyhavewehadnovisitorsfromouter

spaceyet?Firstofall,theymayhaveetothisplaofours

thousandsormillionsofyearsago,andfoundourthen

prevailingprimitivestatepletelyuninterestingtotheirown

advancedknowledge.ProfessorRonaldBracewell,aleading

Americanradioastronomer,arguedinNaturethatsucha

superiorcivilization,