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
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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
Concerning the drug quinine, which of the following is NOT true
A．Originally, quinine was made from some tree bark.
B．Quinine is used to cure malaria.
C．Now, the cinchona tree is no longer the only source of quinine.
D．It was the Spanish people who first used quinine as a medicine.
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