英语（人教版必修4）课件Unit2Period3UsingLanguage

Unit2

WorkingthelandPeriod3

UsingLanguageⅠ.根据英文释义搭配单词1．mineral

A．anyofvariousespeciallysolidsubstances thatareformednaturallyintheearth，suchas stone，coalandsalt，especially2．root B．readquicklyinordertofindthechief points3．skim C．makearemark；giveanopinion4．underline D．thefactorconditionfromwhich sth.begins，orbywhichsth.iscaused5．comment E．drawalineunderaword，etc.答案：1.A

2.D

3.B

4.E

5.CⅡ.根据所给词性及汉语提示写出下列单词1．_______(vt.)使迷惑；使为难→confusing(adj.)令人迷惑的→confused(adj.)感到迷惑的→confusion(n.)迷惑2．________(adj.)化学的；关于化学的→chemistry(n.)化学3．__________(n.)生产；制造→produce(v.)生产4．discover(vt.)发现→__________(n.)发现；发觉5．________(vt.)减少；减缩→reduction(n.)减少confusechemicalproductiondiscoveryreduceⅢ.根据所给汉语补全下列短语1．________addition而且，此处2．turn________转向3．focus________集中(注意力；精力)于4．________...freefrom...使……免受(影响、伤害等)

使……不含(有害物)5．prevent...________...阻止……做……intoonkeepfromⅣ.根据语境和汉语提示写出下列短语1．Ifthereisabigflood，itwill________________(对……造成损害)thehouselyinglow.2．Thestudentistryingto________theink________(洗掉)hishands.3．Withhisefforttohelpthoseinneed，hisfameisgoingto________(逐渐增强)．4．Whatyouhavedonewill________(导致)thefailureoftheproject.causedamagetowashoffbuildupleadtoⅠ.Readthepassagequicklyandmatcheachpartwithitsmainidea.Part1(Para.1)

A．Farmersandcustomersturntoorganicfarmingandhowfarmerskeeptheirsoilrich.Part2(Para.2)B．Scientistshavefoundthatchemicalfertilizerscausedamagetothelandandpeople’shealth.Part3(Paras.3&4)C．Someoftheproblemscausedbychemicalfertilizers.答案：Part1－B

Part2－C

Part3－AⅡ.Readthepassagecarefullyandchoosethebestanswers.1．Whatdoes“organicfarming”introducedinthepassagereferto?A．Allfarmingconcerningcrop­planting.B．Cropsgrowingwithnaturalfertilizersinsteadofchemicalones.C．Cropsgrowingwithchemicalfertilizers.D．Cropsgrowinginpoorsoil.2．Organicfarmerspreferusing________.A．chemicalfertilizersB．naturalandchemicalfertilizersC．naturalfertilizersD．somekindofchemicalfertilizers3．WhichofthefollowingisTRUE?A．Allfarmingisorganicfarming.B．Someorganicfarmerspreferplantinggrassbetweencropstomakefulluseofthefield.C．Farmersoftengrowthesamecropsyearafteryear.Inthisway，theycanhaveagoodharvest.D．Usingnaturalwastefromanimalscanhelpreducediseaseincropsandhelpthemgrowstrongandhealthy.4.Thepurposeofthispassageisto________.A．tellusthestoryoforganicfarmersB．introducetheorganicfarmingC.arguethatorganicfarmingshouldbeencouragedD．objecttothetraditionalfarming答案：1～4.BCDBⅢ.Completethefollowingsentencesandthinkaboutthereasons.1．First，theydamagetheland________killingthehelpfulbacteriaandpestsaswell________theharmfulones.2．Thesechemicalsinthefoodsupplybuild________inpeople’sbodies________time.byasupover3．________thesediscoveries，somefarmersandmanycustomersarebeginningtoturn________organicfarming.4．Theyfocus________keepingtheirsoilrichandfree________disease.5．Someorganicfarmerspreferplantinggrass________cropstopreventwindorwater________carryingawaythesoil.WithtoonofbetweenfromⅣ.Fillintheblanksaccordingtothepassageorthegivenwords.Chemicalfertilizersarepopular__1__farmersbecausetheystopcropdiseaseandincrease__2__(produce)．Recently,however，scientists__3__(find)thatlong­termuseofthemcancausedamage__4__thelandandeventopeople’shealth.Now，somefarmersandmanycustomersarebeginningtoturn__5__organicfarming.Organicfarmingistogrowcropswithnaturalbutnotchemicalfertilizers.Organicfarmersfocus__6__keepingtheirsoilrichandfree__7__disease.Inordertokeepthesoilfertile，theyoftenchangethekindofcropineachfield__8__fewyears，orplantcropstousedifferentlevelsofsoil，orplantgrassbetweencropstopreventwindorwater__9__(carry)awaythesoil.Thesemethodshavethesamegoal：togrowgoodfoodandavoid__10__(damage)theenvironmentorpeople’shealth.

答案：1.with

2.production

3.havebeenfinding

4.to

5.to

6.on

7.from/of

8.every

9.(from)carrying

10.damaging◎buildup逐渐增强；建立，开发写出buildup在下列各句中的不同含义①Allthepressurebuiltupandhehasbeenoffworkforweeks.()②Let’staketheresponsibilitytobuildupalow­carboncitybyridingbicycles.()③Inviewofthepresentsituation，wehavetobuildupotherindustries.()逐渐加大/增强建立开发build(oneself)uptosth.为……做准备buildoneselfup增强体质buildupafame建立名声buildupone’shealth/body增进健康④Youmustbuildyourselfupafteryourillness.患病之后，你必须增强体质。⑤I’mverygladtoseethatyourvocabularyisgradually___________.看到你的词汇量在逐渐增加，我很高兴。[名师点津]buildup(＝formsteadily)意为“逐步建立；逐步形成”，如buildupone’sstrength(增强体力)。build还指“建筑；建造”，如buildahouse(建房子)。buildingup◎leadto导致；造成(后果)；通向①Toomuchworkandtoolittlerestoftenleadtoillness.过量的工作和过少的休息经常会引发疾病。leada．..life过……的生活lead...to/into...把……领到/领进……leadsb.todo...使某人做……leadtheway引路；带路②Althoughheisveryfamous，he_________________.尽管他很有名，但是他过着简朴的生活。③She_________________thatshehadalotofinfluence.她使我相信她很有权势。[名师点津]

leadto中的to是介词，后面应该接名词或动名词作宾语。与resultin，bringabout同义，意为“导致”。leadsasimplelifeledmetobelieveHeledtheway，andledustoavillageofTibet.Therewefoundthelocalpeopleledahappylife.他带路，把我们领到了西藏的一个小村庄。在那里，我们发现当地人过着幸福的生活。

◎focuson集中(注意力、精力等)于①Iamtootiredtofocusonanything.我太累了，不能集中精力了。(1)focusone’sattention/thoughts/minds/eyeson...集中注意力/精力/思想/目光于……(2)bring/throwofocus使某物明朗化；使某物突出thefocusofattention关注的焦点②Please____________________thefollowingproblem.请把注意力集中在下面的问题上。③Alloureyeswerefocusedonthespeaker.大家的目光都集中在发言人身上。[名师点津]

表示“集中注意力于……”的短语还有：①payattentiontosth.②putone’sheartintosth.③fixone’sattentiononsth.focusyourattentionon◎reducevt.减少；减缩①Itreducestherisksofheartdisease.这降低了患心脏病的风险。(1)reduce...by...把……减少了……reduce...to...把……降到……reduce...from...to...把……从……减少到……reducethespeed降低速度(2)bereducedto陷入某种境地(3)reductionn．减少；缩小②Withgreateffort，shehasreducedherweight________fivekilogramsinthepast7days.经过很大的努力，她在过去的七天里体重轻了5千克。③She________________beggingforaliving.她被迫沦落至乞讨为生。bywasreducedto[名师点津]reduce”减少”的近义词是decrease，反义词是increase，rise(增加)。这三个词与reduce用法一样，后可接“to...”表示增减的结果，接by...表示增减的幅度。④Theirsalaryhasbeenincreasedby20percentsincelastyear.自去年以来，他们的工资已经增长了20%。◎keep...freefrom/of使……免受(影响、伤害等)；使……不含(有害物)①You’dbetterkeepthisareafreeofairpollution.你们最好让这个地区免受空气污染。befreefrom/of无……的befreetodosth.自由地做……freesb./sth.of/fromsth.使某人/某物摆脱/除去……②Nohumanbeingcan______________mistakes.是人总是免不了犯错误。③Theseexerciseshelp______thebody__________tension.这些锻炼可使紧张的身体放松。befreefrom/offreefrom/of◎commentn.评论；议论

vt.&vi.表达意见；作出评论①Don’toffercommentsifyoucannotunderstandtherealmeaning.如果你不能真正理解它的意义，请不要乱提意见。(1)makecommentson/upon/aboutsth.评论某事withoutcomment不必多说nocomment无可奉告(2)commenton...对……发表评论commentthat...评论说……②Shemadehelpfulcommentson/uponmywork.她对我的工作提出了有益的意见。③－Canyousaysomethingaboutthepresentsituation?你能对当前的形势说说自己的看法吗？－Sorry，___________！对不起，无可奉告！nocomment④Peoplewerealways__________________mysister’slooks.人们总是对我妹妹的容貌评头论足。⑤Hecommentedthathethoughtitwastimeforustogohome.他发表意见说到我们回家的时间了。commentingon/upon[句式剖析](1)这是个主从复合句，that引导的宾语从句作谓语动词find的宾语。(2)havebeenfinding是现在完成进行时。现在完成进行时表示一个动作开始于