单项选择题

The author's argument concerning the importance of epidemics in the decrease of Native Ameri cans 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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单项选择题
It is implied in the passage ______.
A．measles is not usually a fatal disease
B．measles ceased to be problem by the seventeenth century
C．measles is the disease most commonly involved in virgin-soil epidemics
D．measles was not a significant problem in Spanish colonies
单项选择题
According to the passage, the British colonists were unlike the Spanish colonists in that ______.
A．the British colonists collected tribute from the native population
B．the British colonists kept records from a very early date
C．the British colonists drove Native Americans off the land
D．the British colonists were unable to provide medical care against epidemic disease
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