According to the passage, what is the main difference between ritual and drama?

• A、Ritual uses music whereas drama does not. 
  
  

• B、Ritual is shorter than drama. 
  
  

• C、Ritual requires fewer performers than drama. 
  
  

• D、Ritual has a religious purpose and drama does not. 
  
  

Task 1

16.Paragraph       ①      

17.Paragraph      ③        

18.Paragraph      ④    

19.Paragraph      ⑥                

20.Paragraph      ⑦     

A. Soot's Role in Climate Changes Above Oceans and Land

B. Observations of Warming in the Northern Hemisphere

C. Explanation of Increased Warming Effect Caused by Soot

D. Black Soot in Snow and Icy Areas Leading to Climate Change

E. Black Soot Contributing to Global Warming

F. Greenhouse Gases as the Main Factor of Global Warming

Polar explorers can stay alive by wearing warm coats and furs.

• A、True
  
  

• B、False 
  
  

• C、Not Given