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 【B1】______and the good land worked 【B2】______. Thus, each person produces less and this means a 【B3】______average income than could be obtained with a smaller population. Other economists have argued that a large population gives more 【B4】______ for specialization and the development of 【B5】______such as ports, roads and railways, which are not likely to be built unless there is a big demand to 【B6】______them.
    One of the difficulties in carrying out a 【B7】______birth control program lies in the fact that official attitudes to population growth 【B8】______from country to country depending on the level of industrial 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, 【B9】______, whatever the consequences may be. In a highly-industrialized society the problem may be more complex. 【B10】______. When the pressure of population on housing declines, prices also decline and the building industry is weakened. Faced with considerations such as these, 【B11】______, rather than one which is stable or in decline.
【B7】

选项

答案worldwide

解析 根据空前的不定冠词a和空后的名词词组可知所填词为形容词,修饰birth control program(计划生育)。下文的from country to country,the developing country和a highly-industrialized society都暗示了birth controlprogram是全世界范围的(worldwide)。
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