单项选择题

According to the passage, why were doctors in the West sometimes unable to help their patients （）

A．They did not know how to treat the unfamiliar illnesses.
B．They were more interested in establishing practices in the cities.
C．They were more concerned with doing research than with treating patients.
D．They were often overcome by diseases caught from their patients.

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单项选择题

Which of the following statements best expresses the main idea of the passage （）

A．Many people who went West were doctors.
B．Medicine and the people who sold it were not reliable.
C．Many pioneer women died from bites inflicted by snakes and mosquitoes.
D．Pioneer women had to invent their own remedies when they moved West.

单项选择题

Which of the following can be inferred from the passage about patent medicines （）

A．They did not cost much.
B．They helped heal snake bites.
C．They did not work very well.
D．They had a strong tast