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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
29
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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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