单项选择题

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 190Os.

A．spectrum
B．expectation
C．expectancy
D．width
<上一题 目录 下一题>
热门 试题

单项选择题
The ______ of his first complaint led him to contemplate pursuing stronger methods to obtain satisfaction.
A．success
B．eminence
C．efficiency
D．inefficacy
单项选择题
We do not mean to be disrespectful when we refuse to follow the advice of our leader.
A．venerable
B．respectful
C．famous
D．gracious
相关试题