A. It has always been a great barrier to people traveling south.

B. This oil is shipped to many parts of the world.

C. Each region has its special geography and history.

D. Asia is much larger than Europe.

E. All these people have left their influence there.

F. About 40 million people live there today.

21. Reports say that the walkers are mostly from（）

• A、we divide a 30-minute walk into 3 parts
  
  

• B、our in activeness
  
  

• C、we may like to try a longer one
  
  

• D、big cities in America
  
  

• E、a daily 30-minute quick walk
  
  

• F、a face-to-face talk
  
  

13. In Paragraph 4, "that gesture" refers to（）

• A、shaking one's hands
  
  

• B、covering one's face
  
  

• C、twisting one's hands
  
  

• D、rubbing one's face