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

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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.

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