单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．New Year gifts.
B．Birthday gifts.
C．Christmas gifts.
D．Thanksgiving gifts.
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单项选择题
What is the main purpose for Dr. Gray and Dr. Wegner to conduct the experiment
A．To study whether the deliberate hurt hurts more.
B．To let people know deliberately hurting people is evil.
C．To study the phenomenon of stepping on people.
D．To offer students academic credits.
单项选择题
We learn from the passage about Koch Industries that ______.
A．it signed contracts with others only on two issues
B．it believes markets can totally replace other forecasting techniques
C．its business includes goods trading, pesticide, fertilizers and chemical
D．it has applied prediction for less than a year
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