[简答题]The advantages and disadvantages of a large population have long been a subject of discussion among economists (经济学家).

[单项选择] The advantages and disadvantages of a large population have long been a subject of discussion among economists (经济学家). 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 worded intensively. Thus , each person produces less and this means a lower average income than could be obtained with a smaller population. Other economists have argued that a large population gives more scope for specialization 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 carrying out a world—wide birth control program lies in the fact that official attitudes to population growth vary 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
A. goes up
B. is decreasing
C. remains stable
D. is out of control