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听材料,回答问题。 1. Obama visited China for _______ in November, 2009. A. four days B. four weeks C. 50 minutes 2. Obama visited the Forbidden City and the Great Wall _______. A. to show respect to China's culture B. to relax himself C. A and B 3. Obama said the Great Wall could remind him of _______. A. the stories of the Great Wall B. the long history of China C. many historical places in China