試題詳解

16. Why does the author mention the optimism felt in some quarters about future population trends?
(A) To introduce the fact that birth rates in some developing countries may be declining faster than anticipated
(B) To emphasize that most researchers have taken a pessimistic view of population expansion
(C) To show that the demographic transition is a valid model of population trends
(D) To suggest that some countries have worked hard a reducing birth rates