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

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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

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