单项选择题

All of the following are true of the transplantation technique EXCEPT that ______.

A．it avoids the need for subjecting a laboratory subject to repeated major surgery
B．it permits scientists to monitor changes frequently
C．the transplanted cells grow as they would in their normal site
D．the transplanted cells can be easily grown in vitro

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单项选择题

It can be inferred that the author regards a program of controlled fluoridation of public water supplies as ______.

A．an unnecessary government program that wastes economic resources
B．a potentially valuable strategy of preventive medicine
C．a government policy that has relatively little effect on the health of a population
D．an important element of curative medicine

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.