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【简答题】
Directions: In this section, there are three cases. Please select two to analyze. 1.Pin Li was a visiting scholar in an American university. On one of the first days he went to the university, he saw an American coming his way along the corridor. He looked at him and was about to turn his head away when he found the American smiling at him. He was puzzled, and turned around to see whether he was smiling at someone behind himself. There was no one behind. Pin Li was so surprised that he looked at the American again. Again the American smiled at him. Pin Li was sure that he was a stranger, and did not know how to respond to the smile.
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B.
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C.
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B.
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D.
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