预览加载中，请您耐心等待几秒...

考研英语必背作文高分范文.docx

预览
1/8
2/8
3/8
4/8
5/8
6/8
7/8
8/8

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

考研英语必背作文高分范文三年级的英语老师张利从今天起请病假1周，通知1，2班的同学。一班周一3，4节的英语课调到周3的5，6节;2班周二1，2节的英语课到周4的5，6节。请同学们按时上课，发通知者为教务处(DEAN‘SOFFICE)时间为3月30日NOTICEMsZhang,theEnglishteacherofGradethree,isleavingforaweekbecauseforsickness.Therefore,someadaptionhavetobemade.Herearenoticeforyou:Class1--classonMondaycourses3and4changetoWednesdayourses5and6.Class2--classonTuesdaycourses1and2changetoThursdaycourses5and6.Pleasepreparefortheclass.DEAN‘SOFFICE30thMar考研英语必背作文：TopazTopazisahard,transparentmineral.Itisacompoundofaluminum,silica,andfluorine.Gemtopazisvaluable.Jewelerscallthisvarietyofthestone"precioustopaz".Thebest-knownprecioustopazgemsrangeincolorfromrichyellowtolightbrownorpinkishred.Topazisoneofthehardestgemminerals.Inthemineraltableofhardness,ithasaratingof8,whichmeansthataknifecannotcutit,andthattopazwillscratchquartz.Thegoldenvarietyofprecioustopazisquiteuncommon.Mostoftheworld'stopaziswhiteorblue.Thewhiteandbluecrystalsoftopazarelarge,oftenweighingthousandsofcarats.Forthisreason,thevalueoftopazdoesnotdependsomuchonitssizeasitdoeswithdiamondsandmanyotherpreciousstones,wherethevalueincreasesaboutfourtimeswitheachdoublingofweight.Thevalueofatopazislargelydeterminedbyitsquality.Butcolorisalsoimportant:bluetopaz,forinstance,isoftenirradiatedtodeepenandimproveitscolor.Bluetopazisoftensoldasaquamarineandavarietyofbrownquartziswidelysoldastopaz.Thequartzismuchlessbrilliantandmoreplentifulthantruetopaz.Mostofitisvarietyofamethyst:thatheathasturnedbrown.NOTE:topaz/'tэupжz;`topжz/n(a)[U]transparentyellowmineral黄玉(矿物).(b)[C]semi-preciousgemcutfromthis黄玉;黄宝石.考研英语必背作文：Cohesion-tensionTheoryAtmosphericpressurecansupportacolumnofwaterupto10metershigh.Butplantscanmovewatermuchhigher;thesequoiatreecanpumpwatertoitsverytopmorethan100metersabovetheground.Untiltheendofthenineteenthcentury,themovementofwaterintreesandothertallplantswasamystery.Somebotanistshypothesizedthatthelivingcellsofplantsactedaspumps.Butmanyexperimentsdemonstratedthatthestemsofplantsinwhichallthecellsarekilledcanstillmovewatertoapprecia