2015年职称英语理工A阅读理解必考文章字典版

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1、44FJgong-a第九篇AnEssentialScientificProcess一个至关重要的科学过程Alllifeontheearthdependsupongreenplants.Usingsunlight,theplantsproducetheirownfood.Thenanimalsfeedupontheplants.Theytakeinthenutrientstheplantshavemadeandstored.Butthat’snotall.Sunlightalsohelpsaplantproduceoxygen.Someoftheoxyge

2、nisusedbytheplant,butaplantusuallyproducesmoreoxygenthanituses.Theexcessoxygenisnecessaryforanimalsandotherorganismstolive.Theprocessofchanginglightintofoodandoxygeniscalledphotosynthesis.Besideslightenergyfromthesun,plantsalsousewaterandcarbondioxide.Thewatergetstotheplantthroug

3、hitsroots.Thecarbondioxideenterstheleavesthroughtinyopeningscalledstomata.Thecarbondioxidetravelstochloroplasts,specialcellsinthebodiesofgreenplants.Thisiswherephotosynthesistakesplace.Chloroplastscontainthechlorophyllsthatgiveplantstheirgreencolor.Thechlorophyllsarethemoleculest

4、hattraplightenergy.Thetrappedlightenergychangeswaterandcarbondioxidetoproduceoxygenandasimplesugarcalledglucose.Carbondioxideandoxygenmoveintoandoutofthestomata.Watervaporalsomovesoutofthestomata.Morethan90percentofwateraplanttakesinthroughitsrootsescapesthroughthestomata.Duringt

5、hedaytime,thestomataofmostplantsareopen.Thisallowscarbondioxidetoentertheleavesforphotosynthesis.Asnightfalls,carbondioxideisnotneeded.Thestomataofmostplantsclose.Waterlossstops.Ifphotosynthesisceased,therewouldbelittlefoodorotherorganicmatterontheearth.Mostorganismswoulddisappea

6、r.Theearth’satmospherewouldnolongercontainoxygen.Photosynthesisisessentialforlifeonourplanet.练习：1．Inthefirstparagraph，theword“excess”means.B　extra.2．Whichofthefollowingdoesnotmovethroughaplant’sstomata?D　Food.3．Inthetitle,thetermEssentialScientificProcessreferstoA　photosynthesis.

7、4．ThispassageisprimarilydevelopedbyA　explainingaprocess.5．AnothergoodtitleforthispassagewouldbeC　HowPhotosynthesisWorks.第二十二篇RealWorldRobots现实世界中的机器人Whenyouthinkofarobot,doyouenvisionashiny,metallicdevicehavingthesamegeneralshapeasahumanbeing,performinghumanlikefunctions,andrespo

8、ndingtoyourquestionsinamonotonevoiceacce