人教下学期高一英语Unit19 1.ppt
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1、Changes in peoples eating habitsChanges in economic developmentChanges in agricultural produceUseful expressionsIn my opinion you shouldIf I were youAs far as I can see the best thing would be toWouldnt it be better if?I think he is rightWe have to make a choiceWe cant do both,soThe other idea sound
2、s better to meUseful expressionsAs far as I am concerned,I thinkDont you agree thatI cant help thinking thatIt seems to me thatPersonally,I thinkThe point is thatFrom where I stand,From my point of view,I hold the opinion thatIts my considered opinion that1.Look at the pictures and compare tradition
3、al and modern farming.2.What are the advantages and disadvantages of each way?Pre-reading Raising chickensSmall scaleLarge scaleThe farmers can keep only a few chickens.It does not cost a lot to keep the chickens.It is not a lot of work to keep the chickens.The chickens dont have many problems.The c
4、hickens are not so fat.The eggs and the meat taste very good.The chickens are free.The farmers can keep thousands of chickens.It costs a lot of money to keep the chickens.It is a lot of work to keep them:feeding,cleaning,etc.If the chickens get ill,many die or must be killed.The chickens are big and
5、 fat.The meat and eggs dont taste so good.The chickens are not free.FertilizersNatural fertilizer manure/dungChemical fertilizerIts free or can be bought at low price.It is a lot of work to mix it with the soil.It has a bad smell.It takes a lot of place to store.It is difficult to transport.Its expe
6、nsive.It is not a lot of work to mix it with soil.It has no smell.It takes little pace to store.It is easy to transport.HorsepowerAnimals(buffalo/ox)machineThey are not so expensive.The fuel is cheap.(grass/hay)They dont pollute the air.They can be used on all terrain,hill slopes or wet ground.They
7、need to rest sometimes.You can use them for about 10-20 years.If they get young ones,you get more for free.If they totally break down,you can eat them.They are expensive.The fuel is expensive.They pollute the air.They can only be used on flat and dry terrain.They dont need to rest.Climate controlOpe
8、n airGreenhouseIf the weather conditions are bad you can lose the crops.The landscape is more beautiful.The land must be good for farming.Weather conditions are controlled,so they cant damage the crops.It is expensive to build and operate(gas,water,electricity)a greenhouse.If there is a power failur
9、e,you may lose crops.The landscape is ugly.Greenhouse can be built where the land is not suitable for farming.Agriculture has developed over time.Which of the following techniques are more traditional?Which are more modern?Start with the most traditional.a.Chemical fertilisers&electric pumpsb.GM tec
10、hniquec.Growing vegetables in greenhousesd.Fertilization and irrigation12341.In China,how much land can be used for farming?2.Why two or more crops are planted each year?Only 7 percent of the land can be used for farming.It is to make as much use of the land as possible.3.Whats the purpose of develo
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