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单项选择题
A．modify
B．testify
C．rectify
D．justify
单项选择题
A．converge
B．grope
C．strive
D．grip
单项选择题
A．context
B．contest
C．pretext
D．texture
单项选择题
A．amplify
B．foster
C．enhance
D．magnify
单项选择题
A．transaction
B．transmission
C．transformation
D．transition
单项选择题
A．canceled
B．dissipated
C．discarded
D．concealed
单项选择题
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.
单项选择题
A．to provide support for a hypothesis
B．to reconcile opposing viewpoints
C．to refute a common misconception
D．to analyze an argument in detail
单项选择题
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
A．recur more frequently than chronic diseases
B．involve populations with no prior exposure to a disease
C．usually involve a number of interacting diseases
D．are less responsive to medical treatment than are other diseases
