According to the passage, how many major networks are there?

• A、Two.
  
  

• B、Three.
  
  

• C、Four.
  
  

• D、Five.
  
  

Task 1

16.Paragraph  ①  

17.Paragraph  ② 

18.Paragraph  ③ 

19.Paragraph  ④ 

20.Paragraph  ⑤ 

A. Popularity of Science Fiction

B. Future Development

C. Classics of Science Fiction

D. Difficulty in Keeping Ahead of Scientific Advances

E. Its Origin/Past

F. Themes of Modern Science Fiction

Board of directors is the major policy making group in many companies.

• A、True
  
  

• B、False
  
  

• C、Not Given