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
单项选择题
When the Sultan of Baghdad entered the king’s burial chamber, he found ______.
A．nothing
B．it full of treasure
C．the body of the Pharaoh
D．a terrible monster
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