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³ö°æ˵Ã÷ ±¾ÊéʹÓÃ˵Ã÷ Unit 1 Explorers Lesson 1 Burke and Wills£º Across Australia Lesson 2 Alexandra David-Neel£º A French Woman in Tibet Lesson 3 Vitus Bering£º Across Siberia to North America Lesson 4 Robert Scott£º A Race to the South Pole Lesson 5 Into the Deep£º Ocean Exploration Extension Activities Video Highlights£º CNN Video£¬ Deep Sea Exploration Activity Page£º Adventure Trail Dictionary Page£º Understanding Definitions Unit 2 World Issues Lesson 1 World Population Growth Lesson 2 Changes in the Family Lesson 3 Women and Change Lesson 4 Rain Forests £®Lesson 5 The Garbage Project Extension Activities Video Highlights£º CNN Video£¬ Lalita's Story Activity Page£º Crossword Puzzle Dictionary Page£º Working with Word Forms Unit 3 A Mishmash£¬ or Hodgepodge Lesson 1 Roadrunners Lesson 2 Afraid to Fly Lesson 3 Languages and Language Diversity Lesson 4 Skyscrapers Lesson 5 Left-Handedness Extension Activities Video Highlights£º CNN Video£¬ The Green Skyscraper Activity Page£º Familiar Phrases Dictionary Page£º Understanding Grammar Codes Unit 4 Science Lesson 1 Biospheres in Space Lesson 2 Earthquakes Lesson 3 Snow and Hail Lesson 4 Photovoltaic Cells£º Energy Source of the Future Lesson 5 Biological Clocks Extension Activities Video Highlights£º CNN Video£¬ Ozone Depletion Activity Page£º Chemical Crossword Puzzle Dictionary Page£º Doing Dictionary Research Unit 5 Medicine and Health Lesson 1 Headaches Lesson 2 Sleep and Dreams Lesson 3 Health Care and Epidemics Lesson 4 Medicine£º From Leeches to Lasers Lesson 5 Cholesterol and Heart Disease Extension Activities Video Highlights£º CNN Video£¬ The Singing Doctor Activity Page£º Who Said What? Dictionary Page£º Learning About Word Stress Unit Quiz Vocabulary Skills Index Video Transcripts