单项选择题

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.
单项选择题
A．Calling on her parents.B．Teaching.C．Business and pleasure.D．Going back home.
A．Calling on her parents.
B．Teaching.
C．Business and pleasure.
D．Going back home.
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