Photo taken on Dec. 22, 2015 shows crows perching on a tree in smog in Beijing, capital of China, Dec. 22, 2015 (Xinhua/Li Xin)
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Photo taken on Dec. 22, 2015 shows crows perching on a tree in smog in Beijing, capital of China, Dec. 22, 2015 (Xinhua/Li Xin)
