（213? Luoshan county Yi Mo) Read the graphic materials and complete the following questions. Material 1 Zambia, which is located at the beginning of the Great Rift Valley in East Africa, is a biography of Central Africa.

(2) According to the map, farms are distributed along traffic lines (railways and highways) because the terrain along the traffic lines is relatively flat. Convenient transportation; There are many cities and a vast market; Policy support.

(3) Socio-economic factors are mainly analyzed from the aspects of capital, market, technology and management experience, transportation, etc. The economy is backward and the funds are insufficient; The domestic market is small; Insufficient production technology and management experience; The transportation lines are aging, and the transportation capacity is insufficient (or the infrastructure is not perfect).

Therefore, the answer is:

(1) Features: large area in summer, small area in winter (or large changes in winter and summer). Reasons: In summer, the area is controlled by the equatorial low-pressure belt, where updraft prevails and precipitation is high; Affected by the southeast trade winds (trade winds) in winter, there is little precipitation and large evaporation in winter. < P > (2) Distribution characteristics: It is distributed along traffic lines (railways and highways). Reason: The terrain along the traffic lines is relatively flat; Convenient transportation; There are many cities and a vast market; Policy support.

(3) Economic backwardness and insufficient funds; The domestic market is small; Insufficient production technology and management experience; Traffic lines are aging and the capacity is insufficient (or the infrastructure is not perfect).