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"Everyone is doing great," Bryan Amaral, senior curator of mammals at the Smithsonian's National Zoo, said of the three bears. He said that Mei Xiang underwent two artificial inseminations last week, and it's too early to tell if she is pregnant.

"Everything the cows eat is traceable. Cow dung is used to produce methane for power generation, and the solide waste produced in the process is turned into organic fertilizer," Xu said.

"Every granny used to be a mother like our own moth-er. There lives a little bunny inside their hearts. If you unlock their heart with the right key, they are just lovely, cheerful people. That key is dancing," said Wang.

"Denisovan dwellers in the cave remained for a long time, throughout the tough conditions of the Ice Age, during which many archaic human species were once thought to have failed to survive," said Chen Fahu, an academician of Chinese Academy of Sciences. "This will open up more possibilities for future exploration of the relationship between the natural environment and human evolution.

"Even though certain industries will exert some pressure on the US companies in soft market competition, the complementary nature should reflect current Sino-US relations," said Ruan Zongze, vice-president of the China Institute of International Studies in Beijing.