选修7
　　Unit 1 Living well
　　Unit 2 Robots
　　Unit 3 Under the sea
　　Unit 4 Sharing
　　Unit 5 Travelling abroad
选修8
　　Unit 1 A land of diversity
　　Unit 2 Cloning
　　Unit 3 Inventors and inventions
　　Unit 4 Pygmalion
　　Unit 5 Meeting your ancestors