单项选择题
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A. The train to the Market Square is cancelled.
B. The man has missed the train to the Market Square.
C. The next train will leave in ten minutes.
D. The man has come to a wrong station.
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单项选择题
The passage focuses on ______.
A. the new way of communication Pepperberg proposed
B. the problems that Pepperberg faced in the experiment
C. what caused Pepperberg to carry out the experiment
D. how Pepperberg proved her theory about animal thought
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单项选择题
The passage mainly discusses ______.
A. the function of traffic lights
B. the evolution of traffic lights
C. the importance of traffic lights
D. the operation of traffic lights
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