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
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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 1900s.
A．spectrum
B．expectation
C．expectancy
D．width
单项选择题
Animal migration is a seasonal or periodic movement of animals in response to changes in climate or food ______, or to ensure reproduction.
A．alternation
B．availability
C．utilization
D．capacity
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