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
The new secretary has written a remarkably ______ report only in a few pages but with all the details.
A．concise
B．clear
C．precise
D．elaborate
相关试题