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SHANGHAI, Nov.16 (Xinhua) -- U.S. President Barack Obama said here Monday the United States has a positive, constructive and comprehensive relationship with China.     Obama made the remarks during a dialogue with Chinese youth in China's economic hub Shanghai. U.S. President Barack Obama gestures as he delivers a speech at a dialogue with Chinese youth at the Shanghai Science and Technology Museum during his four-day state visit to China, Nov. 16, 2009."Today we have a positive, constructive and comprehensive relationship that opens the door to partnership on the key global issues of our time: economic revocery, development of clean energy, stopping the spread of nuclear weapons and the surge of climate change, the promotion of peace and security in Asia and around theglobe," he said.     Obama arrived in Shanghai late on Sunday and met city officials Monday morning before his meeting with young Chinese.     He will head to Beijing Monday afternoon.

SHANGHAI, Nov. 15 (Xinhua) -- U.S. President Barack Obama arrived in China's economic hub Shanghai on Sunday night, starting a state visit to China.     Air Force One touched down at the Shanghai Pudong International Airport in heavy rain at about 23:10.     This is Obama's first state visit to China since he assumed the presidency in January. He is also the first U.S. president who paid a state visit to China within one year in office.     This year marks the 30th anniversary of diplomatic ties between the People's Republic of China and the United States.     U.S. Secretary of State Hillary Clinton, Permanent Representative to the United Nations Susan Rice and National Security Advisor James Jones also arrived in Shanghai Sunday night. U.S. President Barack Obama arrives in Shanghai on Nov. 15, 2009 to begin his first state visit to ChinaPresident Obama will meet with local officials on Monday and have a dialogue with Chinese youth, during which he is supposed to answer questions from netizens via Xinhuanet, a news website of the Xinhua News Agency on Monday.     He will leave Shanghai Monday afternoon for Beijing, where he will hold talks with Chinese President Hu Jintao and meet with other Chinese leaders.     Leaders of the two countries are expected to discuss bilateral ties and major international and regional issues of common concern, according to diplomatic sources. A girl presents a bouquet to U.S. President Barack Obama after he arrives at Shanghai Pudong International Airport on Nov. 15, 2009Presidents of the two countries have met several times since Obama took office.     They agreed to forge positive, cooperative and comprehensive ties in the 21st century during their first meeting on the sidelines of the Group of 20 financial summit in London in April and pledged to further such relations in another meeting five months later in New York.     Obama's visit to China will be of great significance for the development of Sino-U.S. ties in the new era, Chinese Foreign Minister Yang Jiechi said Saturday.

HEGANG, Heilongjiang, Nov. 23 (Xinhua) -- The death toll from the deadly coal mine blast in northeast China's Heilongjiang Province has risen to 104, said local authorities early Monday morning.     Another four are still trapped in the shaft. Rescuers get ready to go down into the pit to search for survivors at the site of the accident at the Xinxing Coal Mine in Hegang City, northeast China's Heilongjiang Province, on Nov. 22, 2009    The blast happened at around 2:30 a.m. Saturday at the Xinxing Coal Mine under the state-owned Heilongjiang Longmei Mining Holding Group's subsidiary in Hegang City. A total of 528 miners were working underground when the blast happened.

SHANGHAI, Nov. 16 (Xinhua) -- U.S. President Barack Obama said here Monday that the biggest threat to U.S. security is the terrorist groups like al-Qaida.     "I do continue to believe the greatest threat to United States security are the terrorist networks like al-Qaida," Obama said during a dialogue with Chinese students in Shanghai.     He said U.S. troops moved into Afghanistan because al-Qaida wasbeing hosted by the Taliban in Afghanistan but the terror group has now moved over the border of Afghanistan and has networks with other extremist groups throughout the region.     The United States now has 68,000 troops fighting in Afghanistan. Obama is going to decide on whether to grant a request by the top U.S. commander in Afghanistan, Stanley McChrystal, to send 40,000 more troops.     "I do believe it is important for us to stabilize Afghanistan, so that the people of Afghanistan can protect themselves, and they can also be a partner in reducing the power of those extremist networks," he said.     The U.S. president admitted that defeating al-Qaida is a difficult task and is not just a military exercise.     Obama flew into Shanghai from Singapore on Sunday night to kickoff his four-day visit to China, his first trip to the Asian country since taking office in January.     Later Monday, he will fly to Beijing, where he will hold talks with Chinese President Hu Jintao and meet with other Chinese leaders.