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(1) investigated the extraction of material information. It's simpler. By looking at the bending degree of isoline in matter, we can directly tell the regional differentiation law reflected by the change of accumulated temperature from Zhengzhou to Beijing.
(2) Studied the extraction and induction of material information. Find the location through the picture information, and then describe ① the numerical range of geothermal accumulation temperature. The reasons can be analyzed from the angles of latitude and longitude, land and sea position and topography.
(3) Analysis of agricultural location conditions. Based on the characteristics of agricultural regional distribution in China, the evaluation of wheat production conditions in North China Plain should be explained from two aspects: favorable and unfavorable.
(4) Analysis of regional conditions of agricultural production. The main socio-economic factors affecting wheat production can generally be analyzed from the perspectives of market conditions, traffic conditions, national policies, science and technology.