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

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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

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