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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