During the summer vacation, students from the geography interest group of junior two in a school in Jinan went to the Pictorial District for a "red tour" and a "natural ecological tour".

(1) Taihang Mountain ① The dividing line between North China Plain and Loess Plateau; (2) the dividing line between the second step and the third step;

(3) the dividing line between Shanxi and Hebei (choose two)

(2) Hekou to Shaanxi County? The reach is located in the Loess Plateau, with many tributaries, wide drainage area, loose soil, serious vegetation damage and heavy rain in summer.

Serious soil erosion.

(3) Planting trees and grass, returning farmland to forests and grasslands, rationally arranging agricultural production, and building towns by immigrants.

(4) Qinling ① 65438+1October 0 isotherm; ? ②800 mm isoprecipitation line; ? ③ the dividing line between warm temperate zone and subtropical zone;

④ The dividing line between semi-humid area and humid area; ? ⑤ The dividing line between temperate monsoon climate and subtropical monsoon climate.

(5) Zhengzhou

Test analysis:

(1) As can be seen from the figure, B is the Taihang Mountain Range, the dividing line between the second and third steps of Chinese topography, the dividing line between the Loess Plateau and the North China Plain, and the dividing line between Shanxi Province and Hebei Province.

(2) As can be seen from the figure, the sediment concentration in the section from Hekou Town to Shanxian County of the Yellow River has greatly increased, because this section flows through the Loess Plateau, with loose soil, poor vegetation coverage, heavy rain and serious soil erosion. Many tributaries carry a lot of sediment into the Yellow River.

(3) The eco-environmental quality of the Loess Plateau has been significantly improved. The local people have taken measures to control and improve it, such as planting trees and grass, returning farmland to forests and grasslands, rationally arranging agricultural production, and building towns by immigrants.

(4) As can be seen from the figure, A is the Qinling Mountains, which is an important geographical dividing line in eastern China, where China's 1 O℃ isotherm passes, and where China's 800 mm annual precipitation line passes.

(5) Take the train back to Jinan from Xi 'an, and Zhengzhou, Henan Province is the capital city on the return trip.