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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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
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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