Unit One Human Beings
Lesson 1 Body Structure and Function
Lesson 2 Senses
Lesson 3 Nutrition
Lesson 4 Health
Lesson 5 First Aid and Safety
Unit Two Animals
Lesson 1 Classification
Lesson 2 Reptiles
Lesson 3 Mammals
Lesson 4 Water Animals
Lesson 5 Resources
Unit Three Plants
Lesson 1 Seeds and Reproduction
Lesson 2 Roots and Stems
Lesson 3 Leaves
Lesson 4 Fun with Plants
Unit Four Physical World
Lesson 1 Matter
Lesson 2 Water
Lesson 3 Air
Lesson 4 Fire and Heat
Lesson 5 Light and Color
Unit Five Weather
Lesson 1 Wind
Lesson 2 Clouds and Fogs
Lesson 3 Rain and Rainbows
Lesson 4 Snow
Lesson 5 Thunder and Lightning
Unit Six Ecology
Lesson 1 Ecosystem
Lesson 2 Conservation
Lesson 3 Pollution
Lesson 4 Pollution Solutions
Unit Seven Earth and Space
Lesson 1 Universe
Lesson 2 Solar System
Lesson 3 Earth Crust
Lesson 4 Gravity
Lesson 5 Space Travel
Unit Eight Science in Sports
Lesson 1 Computer in Sports
Lesson 2 Timing Technology in Sports
Lesson 3 Materials in Sports
Lesson 4 Science in Sports Broadcast
Unit Nine Social Concerns
Lesson 1 Daily Problems: Health and Illness
Lesson 2 Educational Systems at Home and Abroad
Lesson 3 Global Problems: Famine, Overpopulation and Poilution
Lesson 4 Cyber Space and Our Life
Lesson 5 Global Science Holidays
Unit Ten Flora and Fauna
Lesson 1 Classification
Lesson 2 Methods of Reproduction
Lesson 3 Fun with Flora and Fauna
Lesson 4 Human Beings and Plants
Lesson 5 Human Beings and Animals
Unit Eleven Subjects of Science
Lesson 1 Mathematics
Lesson 2 Physics
Lesson 3 Chemistry
……
Unit Twelve Sports and Entertatinment
Unit Thirteen Natural Phenomena：Observation and Interpretation
Unit Fourteen Neatural Disasters and Wasys of Salvation
Unit Fifteen Sory of and about the Olympic Games
Unit Sixteen The Updated Achievements of Natural Sciences
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