单项选择题

The author's primary concern is to ______.

A．refute a counterargument
B．draw a distinction
C．discuss a dilemma
D．isolate causes
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单项选择题
Which of the following best explains the author's use of the phrase doubly burdened in Par
A．4A. A person who is iii does not contribute to production; treatment consumes economic resources.B. The per capita cost of preventive measures is only one-half of the per capita cost of treatment.C. The division between preventive medicine and curative medicine requires duplication of administrative expenses.D. The individual who is ill must be rehabilitated after the cure has been successful.
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