Sub-Saharan African countries ______. From the factual data in the passage, we know that by the year 2020 ______.

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问题 Sub-Saharan African countries ______.
From the factual data in the passage, we know that by the year 2020 ______.

选项 A、the population growth rates in Thailand will have increased
B、there will be a disproportionate number of older people
C、US population growth rate will stabilize
D、the average age of Europeans will be 35

答案B

解析 推理题。从文章的最后一段分析可以得出,人口的老龄化问题将会越来越突出,所以人口的老少比例将会严重失调,故B为正确答案。
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