What aspect of drama does the author discuss in the first paragraph?

• A、The reason drama is often unpredictable.
  
  

• B、The seasons in which dramas were performed.
  
  

• C、The seasons in which dramas were performed.
  
  

• D、The importance of costumes in early drama. 
  
  

Heaters should be kept going in the night for men to survive in polar areas.

• A、True
  
  

• B、False
  
  

• C、Not Given
  
  

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