Calculated in terms of food supply, although the self-sufficiency rate of grain in China fell to 90% in 2011, the main source of imports was soybeans rather than grains. The self-sufficiency rates of the main cereal varieties, rice, wheat, and corn, still exceeded 98%. What does this text say? ["China's grain self-sufficiency rate remains high.", 'China needs to increase imports of cereals.', "China's soybean supply mainly depends on imports.", 'China needs to expand exports of cereal varieties.']