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
It can be inferred from the text about the Native American inhabitants of Ungava Bay that they
A．were immunologically defenseless against measles
B．could scarcely ward off the fatal attack by the 1952 epidemic
C．were the last native people to be struck by a virgin-soil .epidemic
D．didn't come into frequent contact with White Americans until the 20th century
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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