Question 28 is based on the following reading. (4pts each)

Rising life expectancy and a drop in fertility rates mean that the world's population is aging. In the twenty- first century, this development will accelerate not only in the rich countries but also in many other parts of the world. As gratifying as it is to have people living longer, increased longevity is expected to pose many challenges, some of which are already being felt in industrialized economies, most notably Japan.
28. What is the main idea of the passage?
(A) The problems of graying population in Japan.
(B) The trend of aging population in the twenty-first century.
(C) The low fertility rates increase the population growing.
(D) The suffers of rising life expectancy in developing countries. 

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