单项选择题

A．To a movie.
B．On a two-week trip.
C．To work.
D．On a short visit to their neighbor.
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单项选择题
A．Their flying ability improved greatly.B．They became warm-blooded.C．They began to lay eggs.D．They changed their migration patterns.
A．Their flying ability improved greatly.
B．They became warm-blooded.
C．They began to lay eggs.
D．They changed their migration patterns.
单项选择题
A．To find out how clever monkeys were.B．To test intelligence of different animals.C．To tell the difference between man and the monkeys.D．To find out how monkeys search food.
A．To find out how clever monkeys were.
B．To test intelligence of different animals.
C．To tell the difference between man and the monkeys.
D．To find out how monkeys search food.
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