The advantages and disadvantages of a large population have long been a subj

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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】______. 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】______ [br] 【B5】

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答案 facilities

解析 意为“(使工作等便利的)设施”。所填词后面的such as表示列举,也就是说,ports,roads and railways都属于所填词的范畴,这些都是使交通便利的设施。
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