Unit 5Using Laguage2 Language points （ppt课件）-2022新人教版（2019）《高中英语》选择性必修第一册.pptx

1、Unit 5 Using Language 2 Language pointsCHEMICAL VERSUS ORGANIC FARMINGChemical pesticides and artificial fertilisers have been in widespread use in farming since the middle of the 20th century.When they were first introduced,many farmers welcomed them as a great way to fight crop disease and increas

2、e production.Over time,however,what some scientists have found is that their long-term use can sometimes harm both the land and peoples health.此句中包含两个从句，分别是此句中包含两个从句，分别是what引导的引导的_主语从句，主语从句，what在此从句中充当在此从句中充当_语；语；以及以及that引导的引导的_从句，从句，that在此从句中在此从句中_成分；成分；_实际意义，但实际意义，但_省略省略Chemical pesticides and art

3、ificial fertilisers_(be)in widespread use in farming since the middle of the 20th century.When they were first introduced,many farmers welcomed them_ a great way to fight crop disease and increase production.Over time,_,what some scientists have found is _ their long-term use can sometimes harm both

4、 the land _ peoples health.have beenashoweverthatandFor example,pesticides can damage the land by killing not only harmful bacteria and insects,but also helpful ones.In addition,these chemicals can stay in the soil and underground water sources for a long time.This affects the crops grown on the lan

5、d and,in turn,the animals and humans who digest them.Many people worry that these chemicals may make them ill and even cause cancer.In fact,some pesticides like DDT have been prohibited in most countries because of the damage they cause to people and the environment.As for chemical fertilisers,crops

6、 grown with them usually grow too fast to be rich in nutrition.They may look beautiful on the outside,but inside there is usually more water than essential minerals,and they often have less flavour as well.此句中此句中grown on the land 是过去分词短语做是过去分词短语做_语；修语；修饰饰_;此句中的此句中的who digest them是是_从句，其先从句，其先行词是行词是_

7、essential:essence本质；实质；本质；实质；in essence从本质上讲从本质上讲be essential to 对对.很重要很重要It is essential(for sb)to do sth(对某人来说对某人来说)做某事很重要做某事很重要It is essential that.(should)do 做做.很必要很必要1.Water and food are essential_living things(生物生物)2.It is good for you to learn to read body language,which is essential to_(deve

8、lop)your social skills3.As we all know,it is essential for students _(make)careful preparations for the exam.4.每个学生都必须有充足的睡眠和规律的锻炼每个学生都必须有充足的睡眠和规律的锻炼For example,pesticides can damage the land by _(kill)not only harmful bacteria and insects,_also helpful ones.In addition,these chemicals can stay in t

9、he soil and underground water sources for a long time.This affects the crops grown on the land and,in turn,the animals and humans _ digest them.Many people worry that these chemicals may make them ill and even cause cancer.In fact,some pesticides _DDT have been prohibited in most countries because o

10、f the damage they cause_people and the environment.As for chemical fertilisers,crops grown with them usually grow too fast _(be)rich in nutrition.They may look beautiful on the outside,but inside there is usually more water than essential minerals,and they often have _(little)flavour as well.killing

11、butwholiketoto belessAs an alternative,some farmers have switched to organic farming,and many customers have turned to organic food when they shop at the local grocery.Organic farming is simply farming without using any chemicals.Organic farmers focus on keeping their soil rich and free of disease t

12、hrough natural means.For example,many organic farmers use natural waste from animals as fertiliser.This makes the soil in their fields richer in minerals.It also keeps the air,soil,water,and crops free of chemicals.an alternative to.的替代品的替代品have no alternative to do sth别无选择只能做某事别无选择只能做某事alternative

13、energy 替代能源替代能源alternative lifestyle/values非传统的生活方式非传统的生活方式/价值观价值观“不得不做某事不得不做某事”的的其他表达：其他表达：cant but do sth;cant choose/help but doby all means 当然行；可以当然行；可以by no means绝不绝不by means of借助借助.的手段；依的手段；依靠靠.的方法的方法As_ alternative,some farmers have switched to organic farming,and many customers have turned t

14、o organic food_ they shop at the local grocery.Organic farming is simply farming_ using any chemicals.Organic farmers focus on keeping their soil rich and free _disease through natural means.For example,many organic farmers use natural waste from animals _fertiliser.This makes the soil in their fiel

15、ds richer in minerals.It also keeps the air,soil,water,_ crops free of chemicals.anwhenofaswithoutandOrganic farmers also use many other methods to produce rich soil.They often change the kind of crop grown in each field every year.For instance,they may grow corn or wheat in a field one year,and the

16、n grow beans there the next.Why different crops are grown is because they put important minerals back into the ground,making it ready for the next batch of crops.Organic farmers also plant diverse crops that use different depths of soil to help keep it rich.For example peanuts grow on the grounds su

17、rface,but many other vegetables put down deep roots.The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to peoples health.adj.highwidelongstrongbroadn.v.heightheightenwidthwidenlengthlenghthenstrengthstrengthenbroadenroot.根；根茎根；根茎;根源根源

18、1.We need to get to the root of the problem before we can solve it.2.Since that day,a dream has taken root in my heart.3.No country,no happiness.Everyone must be rooted in the soil of the motherland.问题的根源问题的根源在心里扎根在心里扎根植根于植根于Why different crops are grown is because they put important minerals back i

19、nto the ground,making it ready for the next batch of crops.此句是由此句是由why引导的引导的_从句，从句，why在此从句中在此从句中_成分，成分，_意义，意为意义，意为_;because 引导引导_从句，从句，because在此从句在此从句中中_意义，意为意义，意为_.making.crops做做_状语状语The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or

20、 to peoples health.此句是的主语是此句是的主语是_Organic farmers also use many other _(method)to produce rich soil.They often change the kind of crop grown in each field every year._instance,they may grow corn _wheat in a field one year,and then grow beans there the next.Why different crops are grown _(be)because

21、they put important minerals back into the ground,_(make)it ready for the next batch of crops.Organic farmers also plant diverse crops that use different _(depth)of soil to help keep it rich.For example peanuts grow _ the grounds surface,but many other vegetables put down deep_(root).The goal of usin

22、g different organic farming methods _(be)to grow good food while avoiding damage to the environment or _ peoples health.methodsFororismakingdepthsonrootsistoSome people would prefer to stop the use of man-made chemicals in agriculture entirely.What keeps them from doing so is the fact that chemical

23、farming serves the high demand for food around the world.Organic farming is nowhere near able to meet that need.Therefore,there is still a long way to find a suitable solution that puts sufficient food on the dinner table while keeping people and the environment as healthy as possible.prefer to do r

24、ather than doprefer doing to doingprefer_(n)prefer_(pp)_(pt)nowhere near完全没有；远不及完全没有；远不及Eg.We only had$100 and that was nowhere near enough to buy a new computer.1.You can get nowhere without an objective in life.2.I was crossing the street when a car appeared out of nowhere.没有结果；没有进展没有结果；没有进展突然出现突然

25、出现What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world.本句包含本句包含what引导的引导的_从句，从句，what在此句中在此句中_语；以及语；以及that引导引导的的_从句，从句，that在此句中在此句中_成分，但成分，但_省略省略.可以跟同位语从句的名有可以跟同位语从句的名有news,idea,fact,promise,question,doubt,hope,message,suggest,word(消息消息),pos

26、sibility.同位语从句的连接词有，同位语从句的连接词有，从属连词从属连词：that;whether;连接代词连接代词：who;whom;whose,what,which;连接副词连接副词：when;where;why;how等等1.I heard the news _our class had won the first place2.She hasnt made the decision _she should give up or not3.I have no idea_wine is best-it is a matter of personal taste4.We havent

27、yet settled the problem _we are going to spend our summer vacationSome people would prefer _(stop)the use of man-made chemicals in agriculture _(entire)._ keeps them from doing so is the fact _ chemical farming serves the high demand for food around the world.Organic farming is nowhere near able _(meet)that need.Therefore,there is still a long way to find a suitable _(solve)that puts sufficient food on the dinner table while _(keep)people and the environment as healthy _possible.stoppingentirelyWhatthatto meetsolutionkeepingasThank you