单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．A lack of available flights.
B．Long delays at the airports.
C．Boredom on long flights.
D．Long trips to and from airports.
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单项选择题
A．To find out how clever monkeys were.B．To test the intelligence of different animals.C．To tell the difference between man and the monkey.D．To find out how monkeys search for food.
A．To find out how clever monkeys were.
B．To test the intelligence of different animals.
C．To tell the difference between man and the monkey.
D．To find out how monkeys search for food.
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