With the improvement of living conditions throughout the world, there has been an increase in the life ________ of the human. A、 expectancy B、 expectation C、 exception D、 excursion

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题目内容（河北农业大学大学英语Ⅳ）

With the improvement of living conditions throughout the world, there has been an increase in the life ________ of the human.
A、
expectancy

B、
expectation

C、
exception

D、
excursion

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