单项选择题

What is David Peakall

A．He is a farmer.
B．He is a scientist of physics.
C．He is a toxicologist.
D．He works at the University of Michigan.
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单项选择题
From the passage, we know that dieldrin is ______.
A．a kind of falcon
B．a kind of pesticides
C．a kind of catfish
D．not mentioned in the passage
单项选择题
The main purpose of the first 3 paragraphs of the passage is to ______.
A．prove that contaminants are harmful to health
B．show that contaminants could affect the future generations
C．describe some experiments made by toxicologists
D．urge that pesticides should be abandoned
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