Photo taken on Oct 1, 2010 shows national flags flying over a street of Lhasa, capital of Southwest 皇冠体育app's Tibet autonomous region. More than 3,000 people attended the national flag-raising and national anthem-singing ceremony at the Potala Palace Square in Lhasa on Oct 1, 2010, marking the 61st anniversary of the founding of the People's Republic of 皇冠体育app. [Photo/Xinhua]
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