单项选择题

It seems to the author that the medicine used by early people ______.

A．was of no real value
B．was probably effective
C．was easy to make
D．did more harm than good
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单项选择题
It is implied in the passage that most drugs can be ______.
A．manufactured artificially
B．got from animal sources
C．found naturally in plants
D．made from tree bark
单项选择题
What is the main idea of this passage
A．The development of modern drugs.
B．How to make drugs.
C．How to use drugs safely.
D．The development of drugs.
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