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1高一英语制作人：邹海霞审核人：陈国平流水编号：002高一英语限时阅读训练(一)AWithpetroleumreserve（石油储量）decreasing,thesearchisontoreplacegaswithacleaner,greeneralternative．Thoughmucheco-talkhascenteredonbiofuelsfromcornandsoybeans,thebiofuelthatlooksmorelikelyloreplacepetroleumcomesfromamostunlikelysource:algae．Algae（藻类）,likecorn,soybeans,andothercrops,growthroughphotosynthesis（光合作用）andcanbeprocessedintofueloil．However,theyyield30timesmoreenergythanlandcropssuchassoybeans,accordingtotheU．S．DepartmentofEnergy．Manyalgaespeciesalsocangrowinsaltwaterandpollutedwater—whilecornandsoyrequire,arablelandandfreshwaterthatwillbeinshortsupplyastheworld'spopulationballoons．"Ifyoureplacedallthediesel（柴油）intheU．S．withsoybiodiesel,itwouldtakehalfthelandmassoftheU.S.togrowthosesoybeans,"saysMattCaspari,chiefexecutiveofAuroraBiofuels,aBerkeley,Calif-basedprivatefirmthatspecializesinalgaeoiltechnology．Ontheotherhand,theEnergyDepartmentsaysthatifalgaefuelreplacedallthepetroleumfuelintheUnitedStates,itwouldrequirel5,000squaremiles,whichisafewthousandmileslargerthatMaryland（12,407squareemiles）,the42ndstateinlandarea．Anotherbonus:Becausealgaecanbegrownjustaboutanywhereinaclosedspace,they'rebeingtestedatseveralpowerplantsacrossthenationasacarbonabsorber．Smokestackemissions（烟囱排放物）canbepumpeddirectlyintotheponds,feedingthealgaewhilekeepinggreenhousegasesoutoftheatmosphere．Althoughprocessingtechnologyforalgaefuel—alsoknownas"oilgae"insomeenvironmentalistcircles—isimproving,it'sstillyearsawayfromreachingyourlocalgaspump．"it'sjustaquestionofcost,becausenolarge-scalefacilitieshavebeenbuiltyet,"Casparisays．56．Theunderlinedword"yield"inParagraph2canbereplacedby"_______"．A．controlB．giveinC．growD．produce57．Comparedwithcornandsoybeans,algae_____．A．maypollutewaterandsoilB．providemuchlessenergyC．cangrowinpoorconditionsD．needmorespecialcare58．AccordingtoParagraph3,oneoftheadvantagesofproducingalgaefuelisthat____．A．itcanbeusedmorewidelyB．itismoreeasytoproduceC．itneedsmuchlesslandD．itcostsmuchlessmoney59．WhatdowelearnaboutalgaefromParagraph4?A．Peoplecangrowalgaeanywhere．B．Algaehelpprotecttheenvironment.C．Fishcangetmoreoxygenfromalgae.D．Algaeproductlesswaste．BBirdsthatarehalf-asleep—withonebrainhemisphere(半球)alertandtheothersleeping—controlwhichsideofthebrainremainsawake,accordingtoanewstudyofsleepingducks.Earlierstudieshavedocumentedhalf-brainsleepinawiderangeofbirds.Thebrainhemispherestaketurnssinkingintothesleepstagecharacterizedbyslowbrainwaves.Theeyecontrolledbythesleepinghemispherekeepsshut,whilethewakefulhemisphere’seyestaysopenandalert.Birdsalsocansleepwithbothhemispheresrestingatonce.Decadesofstudiesofbirdgroupsledresearcherstopredictextraalertnessintheend-of-the-rowsleeperswhichtendtobeattackedmoreeasily.Sureenough,theendbirdstendedtowatch2高一英语制作人：邹海霞审核人：陈国平流水编号：002carefullyonthesideawayfromtheircompanions.Ducksintheinnerspotsshowednopreferenceforgazedirection.Also,birdsnappingattheendofthelinedependonsingle-hemispheresleep,ratherthantotalrelaxation,moreoftenthaninnerducksdid.Turning16birdsthroughthepositionsinafour-duckrow,theresearchersfoundthatcomparedwith12percentforbirdsininternalspots,outerbirdshalf-asleepduringsome32percentofnappingtime.“Webelievethisisthefirstevidenceforananimalbehaviorallycontro...