A. a revolution in energy saving B. a way to get rid of pollution C. the solution to world food shortages D. the beginning of the organic farming
A. It required little or no chemical fertilizers B. It increased food production dramatically. C. It saved a lot of water in farming. D. It made the soil more productive.
A. the overuse of chemical fertilizers B. the rapid increase of harmful insects C. the poor air quality in the countryside D. the serious pollution of soil and water
A. It needs no chemical pesticides B. It requires little manual work C. It almost requires no special care D. It demands no complicated equipment
A. the assistance of biology B. the use of modern equipment C. the introduction of a new pesticide D. the repeated planting of the same crop
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