The advantages and disadvantages of a large population have long been a subject of discussion among economists. It has been argu

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问题     The advantages and disadvantages of a large population have long been a subject of discussion among economists. It has been argued that the supply of good land is limited. To feed a large population, inferior land must be cultivated and the good land worked 【B1】______. Thus, each person produces less and this means a 【B2】______average income than could be obtained with a smaller population. Other economists have argued that a large population 【B3】______for specialisation and the development of facilities such as ports, roads and railways, which are not likely to be built unless there is a big demand to justify them.
    One of the difficulties in 【B4】______a worldwide birth control programme lies in the fact that official attitudes to population growth vary from country to country depending on the level of 【B5】______development and the availability of food and raw materials. In the developing country where a vastly-expanded population is pressing hard upon the limits of food, space and natural resources, it will be the first concern of government to 【B6】______the birthrate, whatever the consequences may be. In a highly-industrialised society the problem may be more 【B7】______.
    A decreasing birthrate may lead to 【B8】______because it results in a declining market for manufactured goods. When the pressure of population on housing declines, prices also decline and the building industry is 【B9】______. Faced with 【B10】______such as these, the government of a developed country may well prefer to see a slowly increasing population, rather than one which is stable or in decline.
【B4】

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答案carrying out

解析 carrying out,意为“实行”。
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