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BEIJING, April 4 (Xinhua) -- China's agricultural authorities said Thursday the infectious H7N9 avian flu virus has been detected from pigeon samples collected at a marketplace in Shanghai, as the country reported its fourth death from H7N9 infection.

The new agreements will add six partnerships to the original group of 18, said Chinese State Councilor Yang Jiechi at a signing ceremony during the fifth round of China-U.S. Strategic and Economic Dialogue in Washington.

He suggested the SCO states maintain regional financial, energy and food security, build up infrastructure to promote interconnectivity, seek new economic growth points via technological innovation, and eliminate the conditions that breed social instability by improving living standards and reducing poverty.

"In China, we have a saying that empty talk harms the nation, while practical work builds a nation. To combat desertification, what we need is more action," said Sha Zukang, secretary general of UN Rio+20 Summit, citing the way that people of Kubuqi have handled desertification as an example of "action."

Energy cooperation between China and Russia holds great potential and has gained steam in recent years as the overall ties between the two nations are in their best status than ever.