The weather in Beijing

(1) According to the map, ① Taihang Mountain, with the Loess Plateau in the west.

(2) The topographical features of Beijing are high in the northwest and low in the southeast. The reason for judging is that the river flows from the northwest to the southeast.

(3) There are many sandstorms in Beijing in spring, mainly from Inner Mongolia Autonomous Region. In order to control the sandstorm in Beijing, the measures that the province should take as a sand source are planting trees and grass, returning farmland to grazing and rational grazing;

(4) The climatic data of Beijing, namely the monthly distribution map of temperature and precipitation, belong to the temperate monsoon climate map, with warm and rainy summers and cold and dry winters. The preparation for a trip to Beijing should be to prepare a sun hat and rain gear.

So the answer is:

(1) Taihang Mountain; Loess Plateau;

(2) high in the northwest and low in the southeast; Rivers flow from northwest to southeast;

(3) Inner Mongolia; Planting trees and grass, returning farmland to grazing and rational grazing;

(4) a; Prepare sun hat, rain gear, etc.