单项选择题

The primary purpose of the passage is to ______.

A．refute a common misconception
B．provide support for a hypothesis
C．suggest a solution to a dilemma
D．reconcile opposing viewpoints
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单项选择题
It can be inferred from the passage about Native American inhabitants of Ungava Bay that ______.
A．they were almost all killed by the 1952 epidemic
B．they were defenseless against measles
C．they were the last native people to be struck by a virgin-soil epidemic
D．they did not come into frequent contact with white Americans until the twentieth century
单项选择题
The author' s argument concerning the importance of epidemics in the decrease of Native Americans would be weakened if ______.
A．there was a fixed evidence to determine the pre-Columbian population of the New world at only 80 million
B．spanish tribute recordsed showed periodic population fluctuations
C．documents gave sophisticated Native American medical procedures
D．fossils indicated Native American contact with smallpox prior to 1492
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