考研英語萬能范文

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具體內容：性格使然，大學畢業生有的會選擇就業，有的則會選擇考研。

下面是我給大家整理的，供大家參閱！：obtainingfreshwaterfrom

icebergsthe…

性格使然，大學畢業生有的會選擇就業，有的則會選擇考研。下面是我

給大家整理的，供大家參閱！

：obtainingfreshwaterfromicebergs

theconceptofobtainingfreshwaterfromicebergsthataretowed

topopulatedareasandaridregionsoftheworldwasoncetreated

asajokemoreappropriatetocartoonsthanreallife,butnowit

isbeingconsideredquiteseriouslybymanynations,especially

sincescientistshavewarnedthatthehumanracewilloutgrowits

freshwatersupplyfasterthanitrunsoutoffood.

glaciersareapossiblesourceoffreshwaterthathasbeen

overlookeduntilrecently,three-quartersoftheearthsfreshwater

supplyisstilltiedupinglacialice,areservoirofuntappedfresh

watersoimmensethatitcouldsustainalltheriversoftheworld

for1,000years,floatingontheoceanseveryyearare7,659trillion

metrictonsoficeencasedin10000icebergsthatbreakawayfrom

thepolaricecaps,morethanninetypercentofthemfromantarctica.

hugeglaciersthatstretchovertheshallowcontinentalshelfgive

birthtoicebergsthroughouttheyear,icebergsarenotlikesea

ice,whichisformedwhentheseaitselffreezes,rather,theyare

formedentirelyonland,breakingoffwhenglaciersspreadoverthe

sea.astheydriftawayfromthepolarregion,icebergssometimes

movemysteriouslyinadirectionoppositetothewind,pulledby

subsurfacecurrents,becausetheymeltmoreslowlythansmaller

piecesofice,icebergshavebeenknowntodriftasfarnorthas

35degreessouthoftheequatorintheatlanticocean,tocorral

themandsteerthemtopartsoftheworldwheretheyareneededwould

notbetoodifficult.

：thesourceofenergy

Asummaryofthephysicalandchemicalnatureoflifemustbegin,

notontheEarth,butintheSun;infact,attheSunsverycenter.

Itisherethatistobefoundthesourceoftheenergythatthe

Sunconstantlypoursoutintospaceaslightandheat.Thisenergy

islibratedatthecenteroftheSunasbillionsuponbillionsof

nucleiofhydrogenatomscollidewitheachotherandfusetogether

toformnucleiofhelium,andindoingso,releasesomeoftheenergy

thatisstoredinthenucleiofatoms.Theoutputoflightandheat

oftheSunrequiresthatsome600milliontonsofhydrogenbe

convertedintoheliumintheSuneverysecond.ThistheSunhasbeen

doingforseveralthousandsofmillionsofyear.

ThenuclearenergyisreleasedattheSunscenterashigh-energy

gammaradiation,aformofelectromagneticradiationlikelightand

radiowaves,onlyofverymuchshorterwavelength.Thisgamma

radiationisabsorbedbyatomsinsidetheSuntobereemittedat

slightlylongerwavelengths.Thisradiation,initsturnisabsorbed

andreemitted.Astheenergyfiltersthroughthelayersofthesolar

interior,itpassesthroughtheX-raypartofthespectrum

eventuallybecominglight.Atthisstage,ithasreachedwhatwe

callthesolarsurface,andcanescapeintospacewithoutbeing

absorbedfurtherbysolaratoms.AverysmallfractionoftheSuns

lightandheatisemittedinsuchdirectionsthatafterpassing

unhinderedthroughinterplanetaryspace,ithitstheEarth.

：vision

Humanvisionlikethatofotherprimateshasevolvedinanarboreal

environment.Inthedensecomplexworldofatropicalforest,it

ismoreimportanttoseewellthattodevelopanacutesenseofsmell.

Inthecourseofevolutionmembersoftheprimatelinehaveacquired

largeeyeswhilethesnouthasshrunktogivetheeyeanunimpeded

view.Ofmammalsonlyhumansandsomeprimatesenjoycolorvision.

Theredflagisblacktothebull.Horsesliveinamonochrome

world.lightvisibletohumaneyeshoweveroccupiesonlyavery

narrowbandinthewholeelectromagneticspectrum.Ultravioletrays

areinvisibletohumansthoughantsandhoneybeesaresensitiveto

them.Humansthoughantsandhoneybeesaresensitivetothem.Humans

havenodirectperceptionofinfraredraysunliketherattlesnake

whichhasreceptorstunedintowavelengthslongerthan0.7micron.

Theworldwouldlookeerilydifferentifhumaneyesweresensitive

toinfraredradiation.Theninsteadofthedarknessofnight,we

wouldbeabletomoveeasilyinastrangeshadowlessworldwhere

objectsglowedwithvaryingdegreesofintensity.Buthumaneyes

excelinotherways.Theyareinfactremarkablydiscerningincolor

gradation.Thecolorsensitivityofnormalhumanvisionisrarely

surpassedevenbysophisticatedtechnicaldevices.

：folk

Afolkcultureisasmallisolated,cohesive,conservative,nearly

self-sufficientgroupthatishomogeneousincustomandracewith

astrongfamilyorclanstructureandhighlydevelopedrituals.

Orderismaintainedthroughsanctionsbasedinthereligionor

familyandinterpersonal.Relationshipsarestrong.Traditionis

paramount,andchangecomesinfrequentlyandslowly.Thereis

relativelylittledivisionoflaborintospecializedduties.Rather,

eachpersonisexpectedtoperformagreatvarietyoftasks,though

dutiesmaydifferbetweenthesexes.Mostgoodsarehandmadeand

subsistenceeconomyprevails.Individualismisweaklydevelopedin

folkculturesasaresocialclasses.Unalteredfolkculturesno

longerexistinindustrializedcountriessuchastheUnitedStates

andCanada.PerhapsthenearestmodernequivalentinAngloAmerica

istheAmish,aGermanAmericanfarmingsectthatlargelyrenounces

theproductsandlaborsavingdevicesoftheindustrialage.InAmish

areas,horsedrawnbuggiesstillserveasalocaltransportation

deviceandthefaithfularenotpermittedtoownautomobiles.The

AmishscentralreligiousconceptofDemut"humility”,clearly

reflectstheweaknessofindividualismandsocialclasssotypical

offolkculturesandthereisacorrespondingstrengthofAmishgroup

identity.RarelydotheAmishmarryoutsidetheirsect.Thereligion,

avarietyoftheMennonitefaith,providestheprincipalmechanism

formaintainingorder.

Bycontrastapopularcultureisalargeheterogeneousgroupoften

highlyindividualisticandapronouncedmanyspecialized

professions.Secularinstitutionsofcontrolsuchasthepoliceand

armytaketheplaceofreligionandfamilyinmaintainingorder,

andamoney-basedeconomyprevails.Becauseofthesecontrasts,

“popular"maybeviewedasclearlydifferentfrom〃folk〃.The

popularisreplacingthefolkinindustrializedcountriesandin

manydevelopingnations.Folk-madeobjectsgivewaytotheirpopular

equivalent,usuallybecausethepopularitemismorequicklyor

cheaplyproduced,iseasierortimesavingtouseorleadsmore

prestigetotheowner.

：Bacteria

Bacteriaareextremelysmalllivingthings.Whilewemeasureour

ownsizesininchesorcentimeters,bacterialsizeismeasuredin

microns.Onemicronisathousandthofamillimeter:apinheadis

aboutamillimeteracross.Rod-shapedbacteriaareusuallyfromtwo

tofourmicronslong,whileroundedonesaregenerallyonemicron

indiameter.Thusifyouenlargedaroundedbacteriumathousand

times,itwouldbejustaboutthesizeofapinhead.Anadulthuman

magnifiedbythesameamountwouldbeoveramile(1.6kilometer)

tall.

Evenwithanordinarymicroscope,youmustlookcloselytosee

bacteria.Usingamagnificationof100times,onefindsthat

bacteriaarebarelyvisibleastinyrodsordots.Onecannotmake

outanythingoftheirstructure.Usingspecialstains,onecansee

thatsomebacteriahaveattachedtothemwavy-looking〃hairs〃cal