考研英語必背作文高分范文

考研英語必背作文高分范文

英語作文是我們在考研英語考試未進行的時候就必定會遇到的，這些我

們都知道不是嗎?下面是我給大家整理的考研英語必背作文，供大家參閱！

考研英語必背作文：NOTICE

三年級的英語老師張利從今天起請病假1周，通知1,2班的同學。一

班周一3,4節(jié)的英語課調(diào)到周3的5,6節(jié);2班周二1,2節(jié)的英語課到

周4的5,6節(jié)。

請同學們按時上課，發(fā)通知者為教務處(DEANSOFFICE)時間為3月30

0

NOTICE

MsZhang,theEnglishteacherofGradethree,isleavingfora

weekbecauseforsickness.Therefore,someadaptionhavetobemade.

Herearenoticeforyou:Classi-classonMondaycourses3and4

changetoWednesdayourses5and6.Class2-classonTuesdaycoursesl

and2changetoThursdaycourses5and6.Pleasepreparefortheclass.

DEANSOFFICE

30thMar

考研英語必背作文：Topaz

Topazisahard,transparentmineral.Itisacompoundofaluminum,

silica,andfluorine.Gemtopazisvaluable.Jewelerscallthis

varietyofthestone"precioustopaz”.Thebest-knownprecioustopaz

gemsrangeincolorfromrichyellowtolightbrownorpinkishred.

Topazisoneofthehardestgemminerals.Inthemineraltableof

hardness,ithasaratingof8,whichmeansthataknifecannotcut

it,andthattopazwillscratchquartz.

Thegoldenvarietyofprecioustopazisquiteuncommon.Mostof

theworldstopaziswhiteorblue.Thewhiteandbluecrystalsof

topazarelarge,oftenweighingthousandsofcarats.Forthisreason,

thevalueoftopazdoesnotdependsomuchonitssizeasitdoes

withdiamondsandmanyotherpreciousstones,wherethevalue

increasesaboutfourtimeswitheachdoublingofweight.Thevalue

ofatopazislargelydeterminedbyitsquality.Butcolorisalso

important:bluetopaz,forinstance,isoftenirradiatedtodeepen

andimproveitscolor.

Bluetopazisoftensoldasaquamarineandavarietyofbrown

quartziswidelysoldastopaz.Thequartzismuchlessbrilliant

andmoreplentifulthantruetopaz.Mostofitisvarietyofamethyst:

thatheathasturnedbrown.

NOTE:

topaz/taup?z;'top/z/n(a)[U]transparentyellowmineral

黃玉(礦物).

(b)[C]semi-preciousgemcutfromthis黃玉；黃寶石.

考研英語必背作文：Cohesion-tensionTheory

Atmosphericpressurecansupportacolumnofwaterupto10meters

high.Butplantscanmovewatermuchhigher;thesequoiatreecan

pumpwatertoitsverytopmorethan100metersabovetheground.

Untiltheendofthenineteenthcentury,themovementofwaterin

treesandothertallplantswasamystery.Somebotanists

hypothesizedthatthelivingcellsofplantsactedaspumps.But

manyexperimentsdemonstratedthatthestemsofplantsinwhichall

thecellsarekilledcanstillmovewatertoappreciableheights.

Otherexplanationsforthemovementofwaterinplantshavebeen

basedonrootpressure,apushonthewaterfromtherootsatthe

bottomoftheplant.Butrootpressureisnotnearlygreatenough

topushwatertothetopsoftalltrees.Furthermore,theconifers,

whichareamongthetallesttrees,haveunusuallylowroot

pressures.

Ifwaterisnotpumpedtothetopofatalltree,andifitis

notpushedtothetopofatalltree,thenwemayask:howdoesit

getthere?Accordingtothecurrentlyacceptedcohesion-tension

theory,waterispulledthere.Thepullonarisingcolumnofwater

inaplantresultsfromtheevaporationofwateratthetopofthe

plant.Aswaterislostfromthesurfaceoftheleaves,anegative

pressure,ortension,iscreated.Theevaporatedwaterisreplaced

bywatermovingfrominsidetheplantinunbrokencolumnsthatextend

fromthetopofaplanttoitsroots.Thesameforcesthatcreate

surfacetensioninanysampleofwaterareresponsibleforthe

maintenanceoftheseunbrokencolumnsofwater.Whenwateris

confinedintubesofverysmallbore,theforcesofcohesion(the

attractionbetweenwatermolecules)aresogreatthatthestrength

ofacolumnofwatercompareswiththestrengthofasteelwireof

thesamediameter.Thiscohesivestrengthpermitscolumnsofwater

tobepulledtogreatheightswithoutbeingbroken.

考研英語必背作文：Americanblackbears

Americanblackbearsappearinavarietyofcolorsdespitetheir

name.Intheeasternpartoftheirrange,mostofthesebrown,red,

orevenyellowcoats.Tothenorth,theblackbearisactuallygray

orwhiteincolor.Eveninthesamelitter,bothbrownandblack

furredbearsmaybeborn.

BlackbearsarethesmallestofallAmericanbears,rangingin

lengthfromfivetosixfeet,weighingfromthreehundredtofive

hundredpoundsTheireyesandearsaresmallandtheireyesightand

hearingarenotasgoodastheirsenseofsmell.

Likeallbears,theblackbearistimid,clumsy,andrarely

dangerous,butifattacked,mostcanclimbtreesandcoverground

atgreatspeeds.Whenangryorfrightened,itisaformidableenemy.

Blackbearsfeedonleaves,herbs.Fruit,berries,insects,fish,

andevenlargeranimals.Oneofthemostinterestingcharacteristics

ofbears,includingtheblackbear,istheirwintersleep.Unlike

squirrels,woodchucks,andmanyotherwoodlandanimals,bearsdo

notactuallyhibernate.Althoughthebeardoesnotduringthewinter

moths,sustainingitselffrombodyfat,itstemperatureremains

almostnormal,anditbreathesregularlyfourorfivetimesper

minute.

Mostblackbearslivealone,exceptduringmatingseason.They

prefertoliveincaves,hollowlogs,ordensethickets.Alittle

ofonetofourcubsisborninJanuaryorFebruaryafteragestation

periodofsixtoninemonths,andtheyremainwiththeirmotheruntil

theyarefullygrownoraboutoneandahalfyearsold.Blackbears

canliveaslongasthirtyyearsinthewild,andevenlongerin

gamepreservessetasideforthem.

考研英語必背作文：Statistics

Thereweretwowidelydivergentinfluencesontheearly

developmentofstatisticalmethods.Statisticshadamotherwhowas

dedicatedtokeepingorderlyrecordsofgovernmentunits(states

andstatisticscomefromthesameLatinrootstatus)anda

gentlemanlygamblingfatherwhoreliedonmathematicstoincrease

hisskillatplayingtheoddsingamesofchance.Theinfluenceof

themotherontheoffspring,statistics,isrepresentedbycounting,

measuring,describing,tabulating,ordering,andthetakingof

censuses-allofwhichledtomoderndescriptivestatistics.From

theinfluenceofthefathercamemoderninferentialstatistics,

whichisbasedsquarelyontheoriesofprobability.

Describingcollectionsinvolvestabulating,depictingand

describingcollectionsofdata.Thesedatamaybequantitativesuch

asmeasuresofheight,intelligenceorgradelevel------variables

thatarecharacterizedbyanunderlyingcontinuum—orthedatamay

representqualitativevariables,suchassex,collegemajoror

personalitytype.Largemassesofdatamustgenerallyundergoa

processofsummarizationorreductionbeforetheyare

comprehensible.Descriptivestatisticsisatoolfordescribingor

summarizingorreducingtocomprehensibleformthepropertiesof

anotherwiseunwieldymassofdata.

Inferentialstatisticsisaformalizedbodyofmethodsforsolving

anoth