We can divide it into three parts. The first part is the introduction in the first paragraph. The second part is the main body and includes the next eight paragraphs. The conclusion is the last paragraph, and is the last part.

　　It gives us an example to show us how serious the situation of Aids is in Africa. / It tells us some detailed information about Aids. For example, what causes Aids, the ways people get infected with Aids, how serious the situation is around the world and what the UN and the Chinese government have been doing to deal with this situation./ It refers again to the example mentioned in the first paragraph and points out the key to stopping Aids in the future.

　　Conclusion: We can see how a text is developed. We know that a text usually includes several parts. We call these parts the title, the beginning paragraph, the body paragraph and the concluding paragraph.

　　巩固拓展【能力升华提一提】

　　The title:

　　Are there Extra-Terrestrials?

　　The beginning paragraph:

　　Paragraph 1

　　Topic sentence:

　　Many scientists today believe that life exists elsewhere in the universe—life probably much like that on our own planet.

　　Body paragraph 1:

　　Paragraph 2

　　Topic sentence:

　　What we know of life on earth suggests that life will arise wherever the proper conditions exist.

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