单项选择题

"Files" refer to the ______ on the chessboard.

A．horizontal rows
B．vertical rows
C．diagonal rows
D．squares
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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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