单项选择题

The passage states that teenaged births are ______.

A．rare in developed countries
B．most prevalent in Indonesia
C．common in Rwanda
D．solely responsible for population increases
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单项选择题
Sub-Saharan African countries ______.
A．will have the largest world population by 2020
B．have the highest reproductive rate in the world
C．are only modestly affected by AIDS
D．will have increasingly long life spans
单项选择题
From the factual data in the passage, we know that by the year 2020 ______.
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
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