(20 13? Pingliang) Read Topographic Map of China and answer the following questions. (1) The dotted lines A and B in the figure represent the boundaries of the three steps of Chinese topography, in wh

(20 13? Pingliang) Read Topographic Map of China and answer the following questions. (1) The dotted lines A and B in the figure represent the boundaries of the three steps of Chinese topography, in which (1) The dotted lines A and B in the figure represent the boundaries of the third step of topography in China, where B represents the boundaries of the first and second steps of topography. Shandong province is located on the third step.

(2) In A and B regions, the main wheat producing area is the Northeast Plain. If a lot of wheat in this area is transported to D area, the most suitable transportation mode is railway transportation.

(3) Among the two regions of C and D, the region C is rich in long-staple cotton, that is, the Tarim Basin in Xinjiang, and the region D is planted with tropical cash crops.

(4) Among A, B and C, A is mainly plain; In A, B, C and D, abundant petroleum resources have been found, which is expected to become the new favorite of China petroleum industry in the future.

So the answer is:

( 1)B； Third;

(2) A; Railway transportation;

(3)C； d；

(4) a; C.