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
The “over-the-counter drugs” are those that _______.
A．patients can get without doctors' prescriptions
B．can relieve the symptoms of a disease
C．attack the organism that causes a disease
D．tend to be complex and powerful synthetic drugs
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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