A population explosion will lead to ______. This passage tells us that ______.

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问题 A population explosion will lead to ______.
This passage tells us that ______.

选项 A、the United Nations thinks it possible to avoid a population explosion
B、5.1 billion people are living in the underdeveloped countries
C、in advanced nations the population growth is being controlled
D、the world’s population is increasing.

答案D

解析 本题为主旨题,文章用数字说明人口迅速增长及其带来的担忧,故选D,而A、C项文中没有提及,B项为文章细节,并非主旨,因此排除。
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