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

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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

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.