单项选择题

According to the passage, as a storm approaches, faraway objects look （）

A．hazy because of dust in the air
B．clearer because air pressure is high
C．clearer because air pressure is dropping
D．distorted because of storm clouds

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单项选择题

The Clever Hans syndrome is a danger to be avoided by （）

A．audience
B．researchers
C．veterinarians
D．mathematicians

单项选择题

Where is the Corn Belt located（）

A．Northeast.
B．Midwest.
C．South.
D．West.