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 55.

46. What would be the most suitable title for the text?

• A、Zoos---Best Places for Wild Animals
  
  

• B、Is It Right to Keep Animals in Zoos?
  
  

• C、Zoos--- Places for Fun to the Public
  
  

• D、How Should Animals Be Treated in Zoos?
  
  

17. Everything changed ______ quickly that I almost had no time to think.

• A、such
  
  

• B、how
  
  

• C、as
  
  

• D、so