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China has become the world's largest market for cross-border e-commerce, ringing up a 30 percent annual growth rate in the past few years. About 200,000 small and medium-sized businesses are involved in cross-border e-commence through different platforms with total transactions exceeding 0 billion, said Long Yongtu, former vice-minister of the then Ministry of Foreign Trade and Economic Cooperation.

China has always attached importance to Europe and pursues a positive policy toward the continent, he said.

China began its research on combustible ice in 1998, as one cubic meter of combustible ice, a kind of natural gas hydrate, equals 164 cubic meters of regular natural gas.

China has been upgrading the coal sector. Coal mines with an annual output of less than 300,000 tons would be closed, while large- and medium-sized modern coal mines would be approved for operation in an orderly manner, Li said.

China has made efforts in recent years to shift to a services and innovation-based economic growth pattern. The services sector accounted for 58.8 percent of the country's GDP growth in 2017 and the ratio has further risen in the first quarter of this year, according to the National Bureau of Statistics.