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

<上一题目录下一题>

热门试题

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

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