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Among humans, the effects of aging vary from one individual to another. The aver
Among humans, the effects of aging vary from one individual to another. The aver
游客
2025-04-26
11
管理
问题
Among humans, the effects of aging vary from one individual to another. The average life ______ for Americans is around 75 years, almost twice what it was in the early 1900s.
选项
A、spectrum
B、expectation
C、expectancy
D、width
答案
C
解析
(expectancy预期)。句意为：在人群中；衰老的影响因人而异。美国人的平均预期寿命大约是75岁，差不多是20世纪初期的两倍。A．spectrum光谱；B．expectation期望，期待；D．width广阔。
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