One major obstacle to economic development is population growth.The populat

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问题 One major obstacle to economic development is population growth.
The populations of most developing countries grew at a rate much faster 【M1】______
than that of industrialized countries. One reason for this growth is the high【M2】______
crude birth-rate—the number of alive births per 1,000 people. In some 【M3】______
developing countries, the population is so large that it is barely enough 【M4】______
futile land and other resources to support it. Many less developed countries 【M5】______
depend extensively on agriculture, adding to the problem. In these countries,
an incentive to having many children exists. Most farms are worked by fam- 【M6】______
ilies, and children can work in the fields at an early age. More children mean 【M7】______
more workers. In addition, having many children ensures the parents that
someone will look after them in their old age. Another problem for develop
ing countries is increasing life expectancy—the average remaining lifetime
for persons who reach a certain age. Better education, international aid, and
emphasis on health-care facilities help people live longer. A high life expec
tancy coupled with a high crude birthrate make it difficult to increase per 【M8】______
capita GNP. Finally, people have different views on what is the proper rate
of population growth. Some feel that the earth is too crowded already and 【M9】______
societies should work for zero population growth—the condition in which
the average number of births and deaths balances so that a population stops 【M10】______
growing. Others feel that population growth is a natural event and that ef
forts to disrupt it are morally and religiously wrong. [br] 【M10】

选项

答案 balances — balance

解析这一题有一定难度。主语是the average number of births and deaths，那么它是单数吗?仔细分析，我们会发现，并不是介词词组of births and deaths修饰名词中心词the average number，因为不可能把出生人数和死亡人数的总数加起来算平均数，而应该是出生人数的平均数和死亡人数的平均数，所以主语其实是一个省略的并列结构，完整的应该是the average number of births and the average number of deaths，所以谓语动词应该是复数。

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