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一、阅读理解（本题共4道小题,每小题2分，共40分。
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A
US President Barack Obama visited the Badaling section of the Great Wall in Beijing on Nov. 18th, 2009. The Great Wall was the second sightseeing program for Obama during his visit to China.
Built originally as the biggest defense work in ancient China, the Great Wall today has become one of the must-see places for visiting foreign leaders to the country in the past sixty years.
