单选题 It can be concluded from Paragraph 2 that ______.

A、 a population growth leads to a greater proportion of workforce
B、 a large population does not necessarily mean a high proportion of workforce
C、 the size of the aged determines the proportion of workforce
D、 the proportion of the very young determines the size of workforce

【正确答案】 B

【答案解析】本题从第二段最后一句话“If the population grows rapidly from natural increase,i.e., the number of births greatly exceeds the number of deaths，then as the total population increases，the proportion in the workforce declines．”中可得出答案。