单项选择题

A．She’s unable to attend the study session.
B．She has seen a doctor recently.
C．She’s concerned about medical care.
D．She mentions the need for some medical tests.
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The reasons why health services grow fast today are______, the growing size of the U. S. population and the increasing proportion of older people in the population.
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______is largely responsible for the slight slowdown in the growth of the labor force.
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