单项选择题

The author's purpose in writing this passage is ______.

A．to provide support for a hypothesis
B．to reconcile opposing viewpoints
C．to refute a common misconception
D．to analyze an argument in detail
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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
单项选择题
According to the passage, virgin-soil epidemics can be distinguished from other catastrophic outbreaks of diseases in that virgin-soil epidemics ______.
A．recur more frequently than chronic diseases
B．involve populations with no prior exposure to a disease
C．usually involve a number of interacting diseases
D．are less responsive to medical treatment than are other diseases
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