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

From the passage we learn that among the following four groups of people _______.

A．fat women are over eighty percent water
B．thin men are never eighty percent water
C．new-born infants are over eighty percent water
D．elderly adults are over eighty percent water

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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