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
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
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