Antarctica is colder than Arctic on average.

• 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

The Arctic and Antarctica are no man's lands because of their killing coldness.

• A、True
  
  

• B、False
  
  

• C、Not Given