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Comey also said all of the records were made immediately after each exchanges based on Comey's memory, implying that there were no recordings on Comey's side.

Compared with China, wheat cultivating areas in Pakistan often suffer from drought and high temperatures. During dry season, such as in March and April, temperatures in the country can reach to 33 to 40 degrees Celsius. Besides, wheat growth period in a year in Pakistan spans only 120 to 150 days, while in China, the time span is about 200 days, according to Chen, the general manager.

Concerns that the Hainan free trade port will undermine Hong Kong's status as a global financial, trading and shipping center were dismissed Monday by Lin Nianxiu, deputy director of the National Development and Reform Commission.

Commenting on China's role in resolving the issue, Geng said on Friday that "China's efforts are indispensable and its contribution has been witnessed by all."

Coastal wetland areas have been decreasing, and some marine ecosystems including seaweed and coral are in unhealthy condition, he said, adding that China has occasionally been hit by red tide, which refers to large concentrations of aquatic microorganisms.