单项选择题

To prevent a repetition of this dreadful occurrence, we must discover the element in the food that was served.

A．unknown
B．toxic
C．kind
D．shameful
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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
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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