(1) There is a large area of wheat and corn cultivation (2 points)? Commodity grain agriculture (2 points) dairy farming in the United States and monsoon rice agriculture in northeast China (2 points).
(2) It is warm and rainy in summer, and the terrain is flat, all of which are black soil distribution areas, with fertile soil and sufficient water (6 points).
(3) Insufficient heat and moisture (2 points)
(4) The latitude of American corn belt is slightly lower than that of China corn belt, and the frost-free period is longer, and the heat condition is better than that of Northeast China; Slightly more precipitation; The content of soil organic matter in American corn belt is higher than that in Northeast China, (6 points)? The level of agricultural science and technology in the United States is higher than that in China (2 points)
Test analysis:
(1) The agricultural structure in the northeast of China and the northeast of the United States is similar, and wheat and corn are planted in a large area. From the perspective of agricultural regional types, they are all commodity grain agriculture. However, there are dairy farming in the northeast of the United States and monsoon paddy agriculture in the northeast of China.
(2) The favorable natural conditions for agricultural production in the two places are warm and rainy in summer, flat terrain, black soil distribution area, fertile soil and abundant water resources.
(3) Northeast China has high latitude and little precipitation, and the unfavorable conditions for developing rice planting are insufficient heat and water.
(4) From the analysis of natural conditions, the data in the table show that the latitude position of American corn belt is slightly lower than that of China, and the frost-free period is longer, and the heat condition is better than that of Northeast China. There is a little more precipitation in the United States, and the soil organic matter content in the corn belt in the United States is higher than that in the northeast. From the analysis of socio-economic factors, the high yield of corn in the United States is due to the higher level of agricultural science and technology in the United States than in China.