A geography problem on the internet, etc.

(1) Chengdu; Urumqi; Similarities: they are all located in inland areas; Difference: A province is located in the southwest inland, and B province is located in the northwest inland;

(2)b； B is located in the northwest, with dry climate, sunny weather and high solar energy utilization efficiency. Rich precipitation, rainy weather, less sunny weather, low efficiency of solar energy utilization.

(3) A province with humid climate and abundant water resources can feed a large population; In the second place, the climate is dry and water resources are scarce;

(4) Lanxin Line; Longhai line; Baocheng line;