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 1900s.

A．spectrum
B．expectation
C．expectancy
D．width
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单项选择题
Huxley is ______ optimistic for the future of either man or plant on this planet.
A．anything but
B．nothing but
C．above all
D．rather than
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
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