Based on material 1, determine what kind of route Mengmeng’s travel route is as shown in the picture.

Reading and analyzing the pictures shows:

(1) When Mengmeng was traveling in Africa, she saw: lions chasing animals on the grassland; elephants leisurely playing in the rain forest ; Giraffes are eating leaves on trees; camels are walking in the desert; it can be inferred that Xiaomoon has experienced tropical desert climate, savanna climate, and tropical rain forest climate. Mengmeng’s travel route should be Route A as shown in the picture.

(2) The population of the Sahara Desert in northern Africa is sparsely distributed because the area has a tropical desert climate, which is hot and dry all year round with very little precipitation.

(3) According to the location, ① is the Nile River and ② is the Congo River. The Nile River is the longest river in the world. It flows into the Mediterranean Sea from south to north. It mainly flows through savannah and tropical desert climate zones. There is little precipitation in the basin, so the river water flow is small and the water level changes greatly. The Congo River flows through the Congo Basin and empties into the Atlantic Ocean from east to west; it mainly flows through the tropical rain forest climate zone, with abundant precipitation in the basin, many river tributaries, large water flow, and small water level changes.

So the answer is: (1) A; (2) sparse; hot and dry all year round; (3) small; large.