2022届高考英语一轮复习Unit5Thepowerofnature学案新人教版选修6

Unit5Thepowerofnature

/微时光背诵一由教材充盈“语料库”

一、背单词与词块

（一）背阅读单词一一会认就行

（背诵时遮住右侧汉语，先自主翻译，后比对词义）

1.diagramn.图解；图表；示意图

2.volcano火山

3.ashn.灰；灰末

4.hurricanen.飓风；风暴

5.questionnairen.问卷；调查表

6.databasen,数据库；资料库

7.fountainvi.&vt.泉水般地喷出或涌出

n.喷泉；源泉

8.helmetn.头盔

9.bootn.靴子

10.samplen.样品；样本

11.bungalown.平房；小屋

12.typhoonn.台风

13.thunderstormn.雷暴

14.documentn.文件；证件

15.rainbown.彩虹

16.balconyn.阳台

（二）背重点单词一一写对才行

1.alongsideadv.在旁边；沿着边

prep.在……旁边；沿着……的边

2.WaVen.波浪；波涛

vL波动；起伏；挥手

3.Potentialn.潜在性；可能性；潜能

adj.可能的；潜在的

4.actualadj.实在的；实际的

5.Candidaten.候选人；候补者

6.PrBCioUSadj.贵重的；珍贵的

7.ShOOtvt.射中；射伤

8.ShOtn.射击；枪炮声

9.tremblevi.摇晃；摇动；颤抖

10.SWeatn.汗

vi,出汗

11.PaniCvi.&vt.惊慌

惊慌；恐慌

12.bathevi.洗澡;游泳

13.arousevt.激发;唤醒

14.guaranteevt.保证；担保

(三)背拓展单词一一用准才行

1.equipv.配备；装备fequiPnIQntn.设备；装备

2.appoint4任命；委派fappointmentn.任命；约定

3.evaluate评估；评价；估计fevaluationn.评估

4.absolutea力•.绝对的；完全的fabsoluteIyadκ绝对地；完全地

5.suitn.一套外衣；套装瓶适合；使适宜fsuitablea力:适宜的；合适的

6.erupt打.(指火山)爆发；突然发生feruptionn.火山爆发；(战争等)爆发

7.novel〃.小说adj,新奇的—novelistn,小说家

8.conscious己力：有知觉的；有意识的funconsciousadj.失去知觉的;未察觉的fconsciouslyadv.

有意识地

9.anxiousa√∕.忧虑的；不安的；渴望的fanxiouslyad匕不安地fanXietyn.担心；焦虑；渴望

10.appreciateι七欣赏;感激fappreciationn.欣赏；感激；感谢；鉴赏

11.fog/7.雾；烟雾ffoggy己以有雾的；模糊的

12.comfort一使安慰fcomfortableadj.自在的；舒适的funcomfortablea√∕不舒服的；不舒

适的

13.diverseadj.多种多样的；不同的fdiverSityn,多种多样；多样性

［语境活用］

1.Ithelpschildrentodevelopanappreciation(appreciate)ofpoetryandliterature.

2.IfeltUnConIfortabie(comfortable)inmystomachbecauseIatetoomuch.

3.Inouroffice,Jimisanabsolutely(absolute)brilliantexpertincomputers,andhealways

solvesthecomplexproblemsinafewminutes.

4.Hewasappointedasmanagerofthecompany.Buttoeveryone'ssurprise,hedidn,taccept

theappointmont.(appoint)

5.Hewasanxioustoleaveandhecouldnothidehisanxiety,(anxious)

6.PeoplefromdiverseculturesholddifferentunderstandingontheplayandthisdiverSity

ofopinionsmakesithardtoreachanagreementatthemeeting,(diverse)

7.Doyouwanttoevaluateyourintelligence?Justcompletetheevaluationfrombelow,

please,(evaluate)

02/24

8.TomwasbadlyhurtandstillUneonSCioUSaftertheaccident,buthiswifewasConSCiolIS

andwassmilingtousconsciously,(conscious)

(四)背高频单词一一先“记牢”再“用活”，不背绝对不行

1.appoint匕任命；委派；约定

背

...appointsb.as/tobe...任命某人为....

词

appointsb.todosth.委派某人做某事

条

(2)makeanappointmentwithsb.与某人预约/约会

用

keep/breakanappointment守/违(爽)约

法

①Iwasappointedtotakechargeofarrangingalltheactivities

背

onthatday.

写

我被指定负责安排那一天的所有活动。

作

②(2020•全国卷In书面表达)Canwemakeanappointmenttomeet

佳

youatyouroffice?

句

我们可以做一个约定去你办公室见你吗？

2.suitn.一套外衣；套装适合；使适宜

(l)asuitof一套....

背

...to...to...使...适合....

词

followsuit仿效

条

(2)besuitedfor/tosth.(某人)适合某物

用

(3)besuitableforsb.(某物)适合某人

法

besuitabletodosth.适合做某事

©Asstudents,you,dbetterchoosetheactivitieswhichinterestyouand

写suityou.

作作为学生，你最好选择那些你感兴趣并适合你的活动。

佳②Thecourseissuitableforbeginnersandadvancedstudents.

句本课程适合初学者和高年级学生。

3.anxious及。忧虑的；不安的

背

[forsb.

词(l)beanxious为……担心/担忧

aboutsth.

条

beanxioustodosth.渴望做某事

用

(2)withanxiety=anxiousIy焦虑地；焦急地

法

背φMenareanxioustoimprovetheircircumstances,butareunwilling

写toimprovethemselves;theythereforeremainbound.

作人们渴望改善他们的周遭环境，但是却不愿意改善自己，他们因此停留在

佳原地，无法进步。

句②Theoldwomanwasawaitingthereturnofherrelativeswithanxiety.

老妇人焦急地等待着她的亲戚们回来。

4.panic惊慌；恐慌”£此（使）惊慌/恐慌

背

词（1）inpanic惊慌失措地

条getintoapanic陷入恐慌

用(2)panic...intodoingsth.使...惊慌地做某事

法

-ɪ@IhavetoadmitthatIwasinpanicwhenIsawthismessagein

写thefirst.

作我不得不承认当我最初看到这些信息时我感到恐慌。

佳②Shegetsintoamadpanicwhenshecouldn,tfindtheexit.

句由于找不到出口，她陷入了恐慌之中。

5.guarantee保证；担保〃.保证；担保；保修单

背

(1)guaranteetodosth.保证做某事

词

guaranteesb.sth.保证某人某事

条

(2)underguarantee在保修期内

用

givesb.aguaranteethat…向某人保证...

法

①(2020,天津7月高考书面表达)1guaranteetofollowtheirexamples

背

totakemyownresponsibilitytobeareliablepersoninthefuture.

写

我保证会以他们为榜样，承担起自己的责任，将来成为一个值得信赖的人。

作

②Thecarislessthanayearold,andthereforestillunder

佳

guarantee.

句

这辆车用了不到一年，因此还在保修期内。

（五）背短语词块一一表达出彩，需多积词块才行

I单元短语再认再现

1.burntotheground全部焚毁

2.makeone’SWay前往

3.beSUitablefor适合；适于

4.InakeUP组成；构成

5.getCloSeto靠近

04/24

6.glancethrough匆匆看一遍

7.behometo・・・是……的家园；为……栖息地

8.beaboutto即将

9.Varyfrom...to...由……到……不等

10.givebirthIo生产；产生

11.haveagiftfor有……的天赋

12.takenolice留意；注意

13.ComPaeeWith与……相比

14.WaVegoodbyeto向……挥手告别

∏重点短语拓展用活

1.makeone,sway前往

背fightone'sway奋力前进

相loseone,Sway迷路

关feelone'sway摸索前进

短pushone,sway挤出来

语windone,sway蜿蜒前进

ɪ①(2020∙全国卷I［书面表达)Wemadeourwaytothefieldssingingand

写laughing.

作我们又唱又笑地向田野走去。

佳(2)TheGreatWal1windsitswayacrossnorthChinalikeahugedragon.

句长城像一条巨龙蜿蜒穿过中国北方。

2.varyfrom...to...由...到....不等

背

相(1)varyin...在♦…（大小、形状等）上不同

关varywith随…∙••变化/改变

短(2)awidevarietyof/varietiesof种种；各种各样的

语

φWeddingtraditionsandcustomsvaryfromonecountryto

背

another.

写

不同国家的婚礼传统和习俗不同。

作

②Therearemanyflowersinthegardenthatvaryincolorand

佳

size.

句

花园里有许多色彩和大小各异的花朵。

二、背佳句与佳作

（一）背写作佳句一一多“输入”才能巧“输出”

I教材内句式举一反三

1.Theothertwoclimbeddownintothecratertocollectsomelavaforlaterstudy,butthis

beingmyfirstexperience,Istayedatthetopandwatchedthem.（独立主格结构）

另外两人攀下火山口去收集供日后研究用的岩浆，我是第一次经历这样的事，所以留在山顶上观察他

们。

Iheardthathegotinjuredintheaccident,myheartfullof

佳句①worries.

听说他在这起事故中受了伤，我内心充满了担忧。

Timepermitting,Iexpecttohavemoresparetimetospendwithmy

friendssothatwecanhaveabetterrelationship.

佳句②

如果时间允许，我希望有更多的空闲时间和我的朋友在一起，这样我们可

以有一个更好的关系。

Somefallingbehind,otherswouldcomeandofferhelp.

佳句③

有些人落后了，其他人会来提供帮助。

2.Itissaidthatthisboy,whohadagreatgiftforlanguagesandpersuasion,isthefather

oftheManchupeople.(^ltissaidthat...“句式)

据说这个男孩就是满族人的祖先，他具有语言天赋和说服力。

Itisbelievedthatadvertisingisoftenthemosteffectivemethodof

佳句①promotion.

人们相信广告往往是最有效的促销手段。

(2018•全国卷I书面表达)Itishopedthatthesesuggestionswouldbeof

佳句②greathelptoyou.

希望这些建议对你有很大的帮助。

（2020,江苏高考书面表达）ItisknownthatChinaenjoysalonghistoryand

佳句③richculture.

众所周知，中国有着悠久的历史和丰富的文化。

∏同主题佳句熟读成诵

1.Recentyearshaveseenabigincreaseinnaturaldisasters,suchasearthquakes,hurricanes

andfloods,whicharebigthreatstopeople'slives.

最近几年自然灾害频发，例如地震、飓风、洪水等，这对人们的生命是个大的威胁。

2.Weshouldadoptconservation,reusingandrecyclingapproachestosolvetheproblemand

takegoodcareofourenvironment.

我们应该采取节约、重新利用和回收利用的办法来解决这个问题，好好保护我们的环境。

3.Itisurgentforustodoourbesttoprotecttheearthandmakeitalovelyplacesuitable

06/24

to1ivein,forwehavenowheretogoandsurviveexceptwherewearenow.

我们迫切需要尽我们最大的努力来保护地球并使它成为一个适合居住的地方，因为除了我们现在居住

的地方，我们没有别的地方可以去并生存下来。

（二）背满分作文一一好习作就靠“仿效”和“背诵”

本辑学点一一倡议书（二）

［题目要求］

近年来，随着科技的发展，可用于学习的电子产品也越来越多，学生的汉字书写能力大大降低。假定

你是李华，是校书法协会的会长，为了让同学们重视书写，你打算写一封倡议书，向校报“英语天地”栏

目投稿，内容包括：

L减少对电子产品的依赖，多动手记笔记；

2.养成练书法和写日记的习惯。

注意：1.词数100左右；

2.可适当增加细节，以使行文连贯。

［背范文］

Dearstudents,

Withthedevelopmentoftechnology,moreandmorestudentstendtouseelectricproducts

fortakingnotes,ratherthanwritingonthepaper.Asaconsequence,ourhandwritingisnot

asgoodasitwasinthepast.Tosolvethisproblem,weshoulddoasfollows：

First,weshoulduselesselectricproductswhiIelearningsothatwecanhavemorechances

toimproveourhandwriting.Alsoitisnecessarythatweformthehabitofpracticingcalligraphy

andkeepingadiaryeveryday.What,smore,itisalsoagoodwaytowriteletterstoourrelatives

andfriendsbyhand.

Beautifulandneathandwritingisbeneficialtousstudents.Solet,stakeactionrightnow!

Γmsureoureffortswilleventuallypayoff!

CalligraphyAssociation

［学亮点］

1.学高级表达

（1）使用高级词汇和语块，如：takenotes,asaconsequence,asfollows,bebeneficialto,take

action,payOff等。

（2）熟练使用高级句式，如：状语从句的省略WhiIelearning；目的状语从句SOthatWeCanhaVemore

chancestoimproveourhandwriting；it作形式主语AlSoitisnecessarythat…和itisalsoa

goodwaytowritelettersto.・.等，增强了文章的表达效果，是加分的亮点所在。

2.学精彩结尾

结尾先用BeaUtifUIandneathandwritingisbeneficialtousStUdentS.强调了好的书法对学生

们的重要性。然后用Solet,stakeaction...提出行动倡议。最后用I'msure...从作者自己的角度

表达了信心。衔接自然、流畅，话语非常有感召力。

3.学过渡衔接

文章中asaconsequence,first,sothat,also,what,smore,Sc）等过渡词语和过渡句TOsolve

thisproblem,weshoulddoasfollows的使用使文章叙述更合理，行文更连贯，逻辑更严密。

4.防微点失分

考生容易把αratherthanwritingonthepaper,,中的writing误用成write,或把“Beautifuland

neathandwritingisbeneficialtousstudents.,,中的beneficial误用成benefit,从而导致失分。

言言新学案设计一由课堂提升“高素养”学案（一）

重点单词的查漏补缺一一打牢必备知识

［全面练一一练清易错微点］

1.单词拼写

1.Thehurricane（飓风）ismovingtothewestatabout18milesperhour.

08/24

2.Wearyoursafetyhelmet(头盔)whenyougodown.Don,ttakeanychances.

3.Shegavemeadiagram(图表)ofrailwaynetwork.

4.TheviolenteruptionofVOlCano(火山)sometimesmakesmanypeoplelosetheirlives.

5.Theywalkedalongside(沿着...的边)theroad,talkinghappily.

*6.Oncemorepeoplearewired,thePOtential(潜能)tochangethemainstreammediawillbe

huge.

7.Sociallifeisthefountain(源泉)ofwisdomofwriters.

8.Thewholehousetrembled(摇晃)whenthetrainwentby.

9.ThelongclimbmadeusSweat(流汗).

10.HemadethatmistakeUnCOnSCiOUSly(未觉察)，whichmadehimupset.

π.根据语境写出加黑部分的汉语意思

*1.WhenIfoundout,Iwantedtogivehimabootupthebackside.踢

*2.Thewindowsfoggedimmediately.起雾

3.Thebookdocumentsthepost-warChineseexperience.记录

4.(2019∙全国卷II)Duringthelongtriphome,followingaweekendofhunting,Ehlersthought

aboutthesmalldoghehadseentremblingalongsidetheroad.在……旁边

5.①Afewtendershootshadstartedtoappear.幼芽

②ThefilmwasshotinPrague.拍摄

*6.(熟词生义)1sweatednightanddaytogetitdoneontime.艰苦努力

III.单句语法填空

1.AmanintheriverwasshoutingandWaVing(wave)hisarmsarounddesperately.

*2.Anothergroupbeganremovingseatsandothertheaterequipment(equip)inpreparation

forthebuilding,send.

3.Justasisknowntoall,everythingisnotabsolutely(absolute)right.

4.Anappreciation(appreciate)ofartwillenrichyourlife.

5.Theeruption(erupt)ofavolcanoisspontaneous.

6.EVaIUation(evaluate)isstandardpracticeforalltrainingarrangedthroughtheschool.

7.Actually(actual),I'mbusyatthemoment-canIcallyouback?

8.Helenisaverywell-knownnovelist(novel)inAustralia.

9.ItwasnowthemiddleofNovember,coldandoftenfoggy(fog).

10.Hisobjectistogatherasgreatadiversity(diverse)ofmaterialaspossible.

名师点拨“一站清”

(l)havethepotentialtodoSth."有潜力做某事”°

(2)boot几靴子，也可用作动词，意为“踢”。

(3)fog〃.雾；烟雾，用作动词时意为“起雾”。

(4)SWeat常用作名词形式，意为“汗水”，用作动词时意为“艰苦努力”。

,,

(5)equipment通常用作不可数名词；“一件设备"应表达为"apieceofequipmento

［重点练一一深化高频考点］

1.appoint

［明其义］

一任命；委派；约定

［通其用］

(1)单句语法填空

©Yesterday,Samwasappointedasmanageroftheengineeringdepartment.

②YoUcanputthebooksintheappointed(appoint)place,andotherparticipantscanhave

freeaccesstothem.

③(2018•北京高考)一Goodmorning,Mr.Lee,soffice.

-Goodmorning.1,dliketomakeanappointcenl(appoint)fornextWednesdayafternoon.

④HewasappointedtoSOIVe(solve)theproblemofenvironmentalpolIution.

(2)补全句子

(S)Apunctualpersonisinthehabitofkeepinganappointmentandneverbreaksanappointment.

一个守时的人有守约的习惯，从不违约。

2.suit

［明其义］

n.一套外衣；套装适合；使适宜

［通其用］

(1)单句语法填空

①Agoodteachersuitshislessonstotheageofhispupils.

©Firstly,becausemyspokenEnglishisfluent,IthinkIamverySUited(suit)forthis

job.

③(2019•江苏高考书面表达)LisuggeststraditionalChineseclotheswhileSuthinkstheschool

uniformsaremoreSUitable(suit).

©Youwillcompleteatleastonemanuscript(手稿)suitabletohand(hand)intoapublisher

bythetimeyoufinishourcourse.

⑤(2020∙江苏高考)Ifyoulookatallsidesofthesituation,you,11findprobablyasolution

thatSUitS(suit)everyone.

(2)一句多译

他不适合这份工作，两周后就离职了。

⑥Hewasn'tSUitedforthejobandleftaftertwoweeks,(suited)

⑦Th6jobWaSrι'tSUitableforhimandheleftaftertwoweeks,(suitable)

10/24

⑧Thejobdicin'tSUithimandheleftaftertwoweeks,(suit)

(3)选词填空(suit/fit/match)

Thehatdoesn,t©suither,foronethingitdoesn,t⑩fitbecauseofitssize;foranother

itscolordoes∏,t?matchhercharmingface.

［解其困］

SUit多指合乎需要、口味、性格、款式等；而fit多指大小、形状的合适；match多指色调、形状、

性质等方面的搭配。

3.anxious

［明其义］

ad∕.忧虑的；不安的

［通其用］

(D单句语法填空

①Thedroughthadlastedseveralmonths,whichmadefarmersanxious(anxiety).

②(2019∙天津高考)Shewasanxioustoknow(know)whathadhappened.

③JaCkstillcan,thelpbeinganxiousabouthisjobinterview.

(S)Anxiously(anxious)IwenttobeddreamingaboutwhatIwouldfindatthetopofthismagical

mountain.

(2)一句多译

我们焦急地等待她平安到达的消息。

(S)WewaitedWithanxietyforthenewsofhersafearrival.

(6)Wewaitedanxiouslyforthenewsofhersafearrival.

4.panic

［明其义］

n.惊慌；恐慌日.&一.(使)惊慌/恐慌

［通其用］

单句语法填空

φNotonlydoonlinerumorscausepeopleɪnpanic,buttheydisturbpublicorder.

②Tompanickedatthesoundofexplosionandhiswifealsogotintoapanic.

©Hearingthegun,thedeerWaSPaniCked(panic)intorunningstraightfortheheadlights.

［解其困］

注意panic的过去式和过去分词都是panickedo

5.guarantee

［明其义］

vt.保证；担保保证；担保；保修单

［通其用］

(1)单句语法填空

①HeguaranteestoPay(pay)offhisdebtsontime,nomatterwhathappens.

②Thedigitalcamerainourshopisofhighquality.Ifthereshouldbesomethingwrongwith

itwhileitisstillUnderguarantee,wewouldrepairitatourexpense.

(2)补全句子

(3)Canyougivemeaguaranteethattheworkwillbefinishedontime?

你能向我保证这项工作会按时完成吗？

学案(二)词块、句式的活学活用一一强化关键能力

［词块的验收盘点］

I.词块点点练一一选词填空

comparewith,behometo,burntotheground,wavegoodbyeto,makeone,Sway,have

agiftfor,glancethrough,varyfrom...to

1.COmParedWithotherEuropeancountries,lifestyleinItalyisslowerandmorerelaxing

initsownway.

*2.ChangbaishanisChina,slargestnaturereserveandishometoagreatdiversityofrare

plantsandanimals.

*3.Ifthebottleofgascatchesfire,thewholebuildingmaybeburnedIotheground.

*4.MymothercriedwhenIWaVedgoodbyetoher.

5.Look!ManychildrenaremakingtheirWaytothebeach.

6.Themanagerwasrushingtotheairportsoheglancedthroughthereportthesecretary

hadtyped.

*7.Thoughheisyoung,hehasagiftforlearningforeignlanguages.

8.(2019∙全国卷I)TypingpatternsVaryfrompersontoperson.

名师点拨“一站清”

(l)behometo”是...的家园”，其中，hoɪne前无冠词，to是介词。

(2)burntotheground“全部焚毁”，本短语中一定要有theo

(3)wavegoodbyetosb.向某人挥手告别

waveto/atsb.:

向某人挥手

givesb.awaveJ

(4)haveagiftfor有……的天赋

∏.易错对对碰——辨析比较

1.gothroughVSgetthrough

φWhenyouhavefinishedyourlistofpersonalpreferences,goIhroUgh

比较

itagain.

12/24

②ThiSmorningItriedtotelephoneyoubutIcould∏,tgetthrough.

(l)gothrough通过；经历；仔细检查

辨清

(2)getthrough接通电话；做完；熬过

2.varyinVSvarywith

①ASinChina,theclimateinCanadaVarieSWiththearea.

比较②TheSetoysVaryinshapeandcolor,attractingchildren*s

attention.

(1)varyin...在∙∙…(大小、形状等)上不同

辨清

(2)varywith随...变化/改变

［句式的验收盘点］

(一)独立主格结构

［通其用］

1.单句语法填空

φTheguideIeading(lead)theway,wehadnotroublegettingoutoftheforest.

②ThetaskCOnIPleted(complete),Wehadaglobaltraveling.

③SUChanablemantohelp(help)you,youwillsurelysucceedsoonerorlater.

2.补全句子

④Herglassesbroken,Shecouldn,tseethewordsontheblackboard.

由于她的眼镜破了，她无法看清黑板上的字。

(S)Tenstudentsenteredforthecompetition,theyoungesta.boyOf12.

十个学生报名参加了这次竞赛，年纪最小的是个12岁的男孩。

［解其困］

独立主格结构的常用形式：

(1)逻辑主语+现在分词

(2)逻辑主语+过去分词

(3)逻辑主语+动词不定式

(4)逻辑主语+形容词/副词/名词/介词短语

注意：独立主格结构的逻辑主语与主句的主语不一致，它独立存在。该结构在句中一般作状语，表示

时间、条件、原因、伴随状况等。

(二)"Itissaidthat…”句式

［通其用］

1,句型转换

(T)Itissaidthatthenewmayorwillcomeintopowernextmonth.

-*ThenewmayorisSaidtoConIeintopowernextmonth.

(2)Itissaidthatcarbondioxideisheatingtheearthtwiceasquicklyaspreviouslyfeared.

fCarbondioxideisSaidtobeheatingtheearthtwiceasquicklyaspreviouslyfeared.

（3）ItissaidthattheearlyEuropeanplaying-cardsweredesignedforentertainmentand

education.

fTheearlyEuropeanplaying-cardsareSaidtohavebeendesignedforentertainmentand

education.

2.补全句子

④ItisSaidIhatthefilmCanbemorePoPUlarWiththeaudience.

据说这部电影更受观众的欢迎。

⑤Itishopedthattheterriblediseasewillsoonbecontrolled.

人们希望这种可怕的疾病能很快得到控制。

⑥IIisbelievedthatJohnwillhelpuswithsomemoney.

大家都相信约翰会资助我们一些钱的。

[解其困]

（1）句式“Itissaidthat...=Sb.issaidtodoSth，意为“据说...”。其中，不定式根

据情况可用一般式、进行式或完成式。在该句型中it为形式主语，that引导主语从句。

（2）其他类似表达还有：

Itisthoughtthat据认为…∙∙

Itisbelievedthat人们相信∙∙

Itisreportedthat据报道…

Itishopedthat人们希望••

Itiswell-knownthat…众所周知••

学案（三）高考语篇的价值发掘一一提升学科素养

2019浙江6月高考•阅读理解C篇一一对接课标主题：人类生存、社会发展与环境的关系

精读真题一一拓展语言能力（语篇中黑体词汇为主题词汇，请注意积累并揣摩其用法）

[l]Californiahaslosthalfitsbigtreessincethe1930s,accordingtoastudytobepublished

Tuesdayandclimatechangeseemstobeamajorfactor（因素）・

[2]Thenumberoftreeslargerthantwofeetacrosshasdeclinedby50percentonmorethan

46,000squaremilesofCaliforniaforests,thenewstudyfinds.Noareawassparedφorunaffected,

fromthefoggynortherncoasttotheSierraNevadaMountainstotheSanGabrielsaboveLosAngeles.

IntheSierrahighcountry,thenumberofbigtreeshasfallenbymorethan55percent;inparts

ofsouthernCaliforniathedeclinewasnearly75percent.

[3]Manyfactorscontributedto2thedecline,saidPatrickMcIntyre,anecologistwhowas

theleadauthorofthestudy.Woodcutterstargeted'bigtrees.Housingdevelopmentpushedinto

thewoods.AggressivewildfirecontrolhasleftCaliforniaforestscrowdedwithsmalltreesthat

competewithbigtreesforresources（资源）・

14/24

[4]But

incomparingastudyofCaliforniaforestsdoneinthe1920sand1930swithanotherone

between2001and2010,McIntyreandhiscolleaguesdocumentedawidespreaddeathofbigtrees

thatwasevidenteveninwildlandsprotectedfromwoodcuttingordevelopment.

[5]Thelossofbigtreeswasgreatestinareaswheretreeshadsufferedthegreatestwater

shortage.Theresearchersfiguredoutwaterstresswithacomputermodelthatcalculatedhow

muchwatertreesweregettingincomparisonwithhowmuchtheyneeded,takingintoaccountsuch

thingsasrainfall,airtemperature,dampnessofsoil,andthetimingofsnowmelt（融雪）.

［6］Sincethe1930s,McIntyresaid,thebiggestfactorsdrivingup,waterstressin