单选题
"Life expectancy" in the last paragraph most probably means ______.
A、
the kind of life that a person may expect to live
B、
the mode of life that a group of people have lived
C、
the length of time that a person or an animal has lived
D、
the length of time that people may expect to live
【正确答案】
D
【答案解析】
由原文最后一句可知Life expectancy 是指“预期寿命”，因为很显然1981 年出生的大部分人现在还并未死亡。
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