单项选择题

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

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

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单项选择题

Where is the Corn Belt located（）

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

单项选择题

A．invent
B．do
C．produce
D．create

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