单项选择题

The author mentions the 1952 measles outbreak most probably in order to______.

A．demonstrate the impact of modern medicine on epidemic disease
B．advocate new research into the continuing problem of epidemic disease
C．confirm the documentary evidence of epidemic disease in colonial America
D．refute allegations of unreliability made against the historical record of colonial America
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单项选择题
Which of the following can be inferred from the text concerning Spanish tribute records
A．They were being kept prior to the seventeenth century.
B．They mention only epidemics of smallpox.
C．They provide quantitative and qualitative evidence about Native American populations.
D．They prove that certain diseases were unknown in the pre-Columbian New World.
单项选择题
According to the passage, virgin-soil epidemics can be distinguished from other catastrophic out- breaks of diseases in that virgin-soil epidemics______.
A．recur more frequently than chronic diseases
B．usually involve a number of interacting diseases
C．involve populations with no prior exposure to a disease
D．are less responsive to medical treatment than are other diseases
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