单项选择题

A．They are beneficial for one’s nerves.
B．They are good for social occasions.
C．They may make people sick.
D．They should be used in a limited way.

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A．That drugs should not be used without doctors advice.
B．That drugs and substances are different.
C．That substances should be used in a scientific way.
D．That the misuse of substances is harmful.

单项选择题

A．People will become seriously ill.
B．People will become dependent on them.
C．They will make people feel tired.
D．They will give people headaches.

单项选择题

A．They are beneficial for one’s nerves.
B．They are good for social occasions.
C．They may make people sick.
D．They should be used in a limited way.