Section 1 Influence of Topography on Settlement and Traffic Line Distribution
1.D 2。 A 3。 A 4。 A 5。 C 6。 A seven. B 8。 A nine. D
10.( 1)② Due to the influence of topography, roads in the valley should be built along contour lines to avoid steep slopes.
(2) Considering economic factors, try to pass through towns as much as possible to increase traffic volume and improve economic benefits.
(3) Schematic diagram of artificial canal (the narrowest and shortest distance between two rivers)
1 1.( 1) total investment: the Qinghai-Tibet railway has short lines, flat terrain along the line, low cost and the least total investment; Yunnan, Tibet and sichuan-tibet railway have to cross high mountains and canyons, with a long route, high cost and a lot of total investment. Natural conditions along the line: the technical problems of frozen soil construction along the Qinghai-Tibet railway have been solved; Yunnan, Tibet and sichuan-tibet railway pass through areas with complex geological conditions, many faults, frequent earthquakes and mudslides, as well as snow and glaciers, which are prone to avalanches and have a great destructive effect.
(2)A (3)D (4)C
(5) Animal products, mineral products, native products, industrial products and people's daily necessities.