2. 职称英语
  3. 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2025-04-24  8
问题 Among humans, the effects of aging vary from one individual to another. The average life ______ for Americans is around 5 years, almost twice what it was in the early 190Os.
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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