单项选择题

Which of the following has the closest meaning to "the pool of contributions" (Para. 1)

A．the amount of each premium
B．the cost of administering insurance
C．money paid by the insurers
D．money paid by the insured
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单项选择题
According to the passage, insurance is possible because ______.
A．only insured people suffer loss
B．nearly everyone suffers a loss
C．only a small proportion of the insured suffer loss
D．everyone at some time suffers loss
单项选择题
The author's attitude toward the progress of health research so far achieved is ______.
A．optimistic
B．objective
C．pessimistic
D．disappointed
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