FILE - In this Feb. 27, 2008 file photo, a worker takes notes next to natural gas storage tanks in El Alto, Bolivia. In recent years, China has agreed to lend and invest tens of billions of dollars around South America, outdoing many other traditional lenders such as the World Bank and the International Monetary Fund. In return, Chinese officials have signed long-term contracts in which borrowing countries pay back their loans through guaranteed shipments of precious commodities, particularly oil, that China needs to keep growing. (AP Photo/Juan Karita, File)

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