大学英语（四）

Lesson 1 Types of Insurance
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Lesson 2 Foreign Language Study in America
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Lesson 3 The International Reserve
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Lesson 4 Abraham Lincoln
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Lesson 5 How Harmful Smoking Can Be to Our Health
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Lesson 6 What Are Futures Markets?
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Lesson 7 "Ever Tried Talking to a Computer?"
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Lesson 8 Underdevelopment and the Sciences
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Lesson 9 Technological Change and Innovations
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Lesson 10　Economic Ups and Downs
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