单项选择题


Questions 17-20 are based on the following dialogue. You now have 20 seconds to read Questions 17-20.
What is the main topic of this conversation

A．Lunch.
B．An exam.
C．A class.
D．A trip.
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单项选择题
What was the purpose of the professor’s experiments
A．To find out how clever monkeys were.
B．To test the intelligence of different animals.
C．To compare the difference between man and the monkey.
D．To find out how monkeys search for food.
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