人类已经迈进了21世纪。这是一个变幻莫测的世纪，这是一个催人奋进的时代。科学技术飞速发展，知识更替日新月异。希望、困惑、机遇、挑战，随时随地都有可能出现在每一个社会成员的生活之中。抓住机遇，寻求发展，迎接挑战，适应变化的制胜法宝就是学习——依靠自己学习、终身学习。

Unit 1 Health
Reading Skills Looking for the Topic Sentence
Text 1 Do We Need Extra Vitamins?
Text 2 Women and Tobacco
Text 3 Are These the Best Years of Your Life?
Unit 2 Environment
Reading Skills Scanning
Text 4 Our Disappearing Wildlife
Text 5 Pollution is a Dirty Word
Text 6 Keeping Food on the Table
Unit 3 Psychology
Reading Skills Reading for Central and Additional Information
Text 7 How to be Happy
Text 8 Never be Nervous Again
Text 9 Hey,Im the Customer
Unit 4 Sports and Body Building
Reading Skills Reading Introductory Phrases and Clauses
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