12. People tend to twist their hands when they are（）

• A、depressed
  
  

• B、angry
  
  

• C、shocked
  
  

• D、nervous
  
  

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.

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