雅思阅读题型精炼与答案解析——选择

　　雅思阅读题型精炼与答案解析选择（Multiple Choice）

　　Academic Reading sample task Multiple Choice

　　All these activities may have damaging environmental impacts. For example, land clearing for agriculture is the largest single cause of deforestation; chemical fertilisers and pesticides may contaminate water supplies; more intensive farming and the abandonment of fallow periods tend to exacerbate soil erosion; and the spread of monoculture and use of high-yielding varieties of crops have been accompanied by the disappearance of old varieties of food plants which might have provided some insurance against pests or diseases in future. Soil erosion threatens the productivity of land in both rich and poor countries. The United States, where the most careful measurements have been done, discovered in 1982 that about one-fifth of its farmland was losing topsoil at a rate likely to diminish the soils productivity. The country subsequently embarked upon a program to convert 11 per cent of its cropped land to meadow or forest. Topsoil in India and China is vanishing much faster than in America.

　　Government policies have frequently compounded the environmental damage that farming can cause. In the rich countries, subsidies for growing crops and price supports for farm output drive up the price of land. The annual value of these subsidies is immense: about $250 billion, or more than all World Bank lending in the 1980s. To increase the output of crops per acre, a farmers easiest option is to use more of the most readily available inputs: fertilisers and pesticides. Fertiliser use doubled in Denmark in the period 1960-1985 and increased in The Netherlands by 150 per cent. The quantity of pesticides applied has risen too: by 69 per cent in 1975-1984 in Denmark, for example, with a rise of 115 per cent in the frequency of application in the three years from 1981.

　　In the late 1980s and early 1990s some efforts were made to reduce farm subsidies. The most dramatic example was that of New Zealand, which scrapped most farm support in 1984. A study of the environmental effects, conducted in 1993, found that the end of fertiliser subsidies had been followed by a fall in fertiliser use . The removal of subsidies also stopped land-clearing and over-stocking, which in the past had been the principal causes of erosion. Farms began to diversify. The one kind of subsidy whose removal appeared to have been bad for the environment was the subsidy to manage soil erosion.

　　In less enlightened countries, and in the European Union, the trend has been to reduce rather than eliminate subsidies, and to introduce new payments to encourage farmers to treat their land in environmentally friendlier ways, or to leave it fallow. It may sound strange but such payments need to be higher than the existing incentives for farmers to grow food crops. Farmers, however, dislike being paid to do nothing. In several countries they have become interested in the possibility of using fuel produced from crop residues either as a replacement for petrol or as fuel for power stations . Such fuels produce far less carbon dioxide than coal or oil, and absorb carbon dioxide as they grow. They are therefore less likely to contribute to the greenhouse effect. But they are rarely competitive with fossil fuels unless subsidised - and growing them does no less environmental harm than other crops.

　　Questions 10 12

　　Choose the appropriate letters A, B, C or D.

　　Write your answers in boxes 10-12 on your answer sheet.

　　10 Research completed in 1982 found that in the United States soil erosion

　　A reduced the productivity of farmland by 20 per cent.

　　B was almost as severe as in India and China.

　　C was causing significant damage to 20 per cent of farmland.

　　D could be reduced by converting cultivated land to meadow or forest.

　　11 By the mid-1980s, farmers in Denmark

　　A used 50 per cent less fertiliser than Dutch farmers.

　　B used twice as much fertiliser as they had in 1960.

　　C applied fertiliser much more frequently than in 1960.

　　D more than doubled the amount of pesticide they used in just 3 years.

　　12 Which one of the following increased in New Zealand after 1984?

　　A farm incomes

　　B use of fertiliser

　　C over-stocking

　　D farm diversification

　　答案在后一页

　　Answers:

　　10 C

　　11 B

　　12 D