Henry Manley had no idea at all why George Strong wanted to see him.

• A、True
  
  

• B、False
  
  

• C、Not Given
  
  

Compared with dreamless sleep, deep dream sleep is

• A、not the result of natural selection
  
  

• B、less likely to appear to monkeys
  
  

• C、more protective to the animals
  
  

• D、at a higher stage of evolution
  
  

Task 2

21. In most cases of cloud-to-ground lightning, the ground's surface__________

22. One form of lightning that is ball lightning. __________

23. Cloud lightning looks like a ribbon when its lighting channel__________

24. Although not fully understanding processes of lightning, man__________

25. Lightening can__________

A. occurs most infrequently

B. is shifted sideways by strong winds

C. strike twice or more in the same spot

D. is equipped with a good knowledge of various forms of lightning

E. is estimated at 20 million a year

F. is positively charged