引导强调句It无意义

1、Unit19ReadingWarming-up: Look at the pictures at p.45, describing what you see and comparing traditional and modern farming. What are the advantages and disadvantages of each way?Scanning *Divide the text into 4 parts and find the main idea of each part:The 1st part the first paragraphThe 2st part t

2、he second paragraphThe 3st part the third paragraphThe 4st part the fourth, fifth and sixth paragraphs.Paragraph 1:Traditional agriculture in China.Paragraph 2:The development of agriculture before the 1980s.Paragraph 3:New techniques to protect environ-ment as well as increasing produs-tion from th

3、e 1990s.Paragraph 4:Ways to solve the problem of the shortage of arable land. What are the ways?1. Grow vegetables in greenhouses. 2. Use GM to create plants that produce more and bigger and better crops. 1.China has only about 67,000 sq. km of arable land. 2. No advanced technical information was b

4、rought in from abroad before 1980. 3.Scientists have always tried to increase farming production without harming the environment since the early 1990s. 4.Traditional methods of farming have no advantages so they wont be used in future agriculture. 5.The average arable land for each Chinese is much l

5、ess than that of the world. TFTFT6. Growing vegetables in green houses has so many advantages that it can reduce losses caused by bad weather and that it can partly settle the problem of the shortage of arable land. 7. GM is a new technique that can make a plant quite different from what it used to

6、be, bigger and healthier and with no diseases, but it takes longer time to grow. 8. The GM technique can only be used on plants, but not on animals at the present time.TFF 7% of arable land to feed 1.3 billion people AGRICULTURETraditional agricultureModern agricultureFuture agricultureone family bu

7、sinesschemical fertilizationhigh technology fertilization, irrigationelectric pump and traditional methodsnot harmful to the environment harmful to the environment take care of the environment green houses GM technique the roots hang in water containing nutrientsprotected from wind, rain and insects

8、computer controls the temperaturea natural seed is changedneed much less timewithout danger from diseasefruits are bigger and healthierQuestions:1.what farming techniques have been modernized ?New methodsPurposesChemical fertilisersElectric pumpsTwo or more crops are planted each yearTo improve the

9、soilTo irrigate the cropsTo increase production2.what are the disadvantages of chemical fertilisers? They are harmful to the environment.3.How will you solve this problem?4.what other techniques can help to solve this problem? GM5.What can we change through GM?Change fruits, vegetables and even anim

10、alsThe way they growWhere they can growHow they will tasteWhat colour and what shape they will have 6.Suppose you are a scientist of GM,how you would change the following and why.KindHow you would change itwhyFruitVegetableAnimal7.What is the biggest problem to Chinese farmers?8. What does GM mean?D

11、iscussionExcept the earth,where else can we find more land?If you were one of the scientist, what would you do to develop agriculture on Mars ?Integrating reading-Get the students to finish the exercise 3 on P110 as an introduction of the text. -Ask the students to pick out as many pieces of advice

12、as possible in the text. The wisdom of farmers about the weather and farming is collected in many popular proverbs and passed on from generation to generation. The following proverbs tell you something about the weather in England. Are they true for China?No weather is ill, if the wind be still.Yell

13、ow sky at sunset, wind in the morrow.Rain before seven, clear by eleven. Aprl showers bring May flowers.Deeds are fruits, words are but leaves.The best ground bears weeds as well as flowers.Never cackle unless you lay.Farmers proverbs and sayingsThe use of “it”(2) for Emphasison this arable landthe

14、farmers produce food for the whole population of China.from the early 1990sscientists started to develop new techniques to increase agricultural production without harming the environment. Grammar1. It is on this arable land that the farmers produce food for the whole population of China.“it” 引导强调句。

15、It无意义，只起语法作用。Jia Sixie wrote a book called Qimin- It was Jia Sixie who wrote a book called Qimin Yaoshu around 540 AD.- It was a book called Qimin Yaoshu that Jia Sixie wrote around 540 AD.- It was around 540 AD that Jia Sixie wrote a book called Qinmin Yaoshu.-其结构：其结构：It + be + 强调部分强调部分 + that (人物用

16、人物用who/whom) 句子其他成分。句子其他成分。1. 强调主语强调主语 The children often help the parents do he farm work. It is the children who often help the parents do the farm work.2. 强调宾语强调宾语 Future agriculture should depend on high technology. It is high technology that future agriculture should depend on.3. 强调地点、时间等状语。强调地

17、点、时间等状语。 The farmers produced food for the whole population of China on this arable land. It was high technology that future agriculture should depend on.To make as much use of the land as possible, two or more crops are planted each year where possible.(1)as as possible 尽可能的尽可能的.We need to send the

18、 letter off as soon as possible.Hold your breath for as long as possible.(2) where possible = where it is possible.Fill in the words in the blanks where necessary.Come to see her when possible.Some useful expressions in the text:make as much use of the land as possible, bring in, as well as, be harmfu