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
The population growth rate in the US is______.
A．higher than that in India
B．lower than that in Mexico
C．higher than that in Indonesia
D．lower than that in South America
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