单选题
The size of the workforce declines when ______.
A、
many people reach the retiring age
B、
the birth rate falls rapidly
C、
the number of retirees exceeds that of new workers
D、
the death rate increases
【正确答案】
C
【答案解析】
本题属于细节题,在文章第三段可找到正确的对应。
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