1. D) Scientists’ vision of the world in half a century.

　　2. B) may not come true

　　3. A) humans won’t have to donate organs for transplantation

　　4. C) live to 100 and more with vitality

　　5. C) alien life will likely be discovered

　　6. A ) might survive all catastrophes on earth

　　7. D) lost fingers and limbs will be able to regrow

　　8.artificial intelligence

　　9.weapons and greenhouse gas

　　10.religion