Unit 19课件（PPT 40页）.ppt

5. Traditional methods of farming have no advantages so they won’t be used in future agriculture. 6. The average arable land for each Chinese is much less than that of the world. 7. 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. 8. GM is a new technique that can make a plant quite different from what it used to be, bigger and healthier and with no diseases, but it takes longer time to grow. 9. The GM technique can only be used on plants, but not on animals at the present time. 1. China has only about 67,000 sq. km of arable land. 2. Which of the following ways did the farmer make use of to increase farm production before the 1980s? A. the use of machines, eg. tractors ( ) B. the use of electric pumps ( ) C. the use of chemical fertilizers ( ) D. the use of GM ( ) E. the use of insect killers ( ) F. the use of special seedbeds ( ) G. more than one crop is planted each year wherever possible ( ) 3. No advanced technical information was brought in from abroad before 1980. 4. Scientists have always tried to increase farming production without harming the environment since the early 1990s. T T T T F T T T F T 5. Traditional methods of farming have no advantages so they won’t be used in future agriculture. 6. The average arable land for each Chinese is much less than that of the world. 7. 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.