题目内容：
Write an outline (20 points)Read the following passage carefully and compose a“topic outline”for it．
Africas
When many people hear the word “Africa”, inevitably they picture steaming jungles and gorillas and other wild animals. Hollywood films have shrunk the public image of this immense, varied continent into a small segment of its actual diversity. To have a more accurate picture of the whole continent, however, one should remember that the continent can be roughly divided into three Africas: the northern desert areas, the southeastern grasslands, and the tropical jungles to the southwest, each with its distinct climate and terrain and with a style of life suited to the environment.
The northern regions have the environment and living patterns of the desert. Egypt, Libya, Algeria, and Morocco have hot, dry climates with very little land suited to farming. Green fields cannot be easily seen. Therefore, the population tends to be clustered into cities along rivers or the seacoast or into smaller settlements near oases. For thousands of years, people have lived in this vast region, relying partly on what the land could offer such as crops and animals they could raise and partly on trade with Europe.
The southeastern grasslands provide a better environment for animal life and for some kinds of crops. Many wild animals inhabit the plains in this region—elephants, g
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