快速阅读部分答案：

1. D   Scientists' vision of the world in a half 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 vitality

5. C    alone 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

10. religion

简短回答
47.  causing a reaction

48. an emotional debate

49. the approval of every victim's family

50. exploiting a national tragedy

51. raise awareness