Why does the author mention the specimen preserved in the birth canal?

• A、To illustrate that the embryo fossils are quite advanced in their development.
  
  

• B、To explain why the fossils are well preserved
  
  

• C、To explain why the fossils are well preserved
  
  

• D、To prove that ichthyosaurs are marine animals
  
  

To measure life quality is easy.

• A、True
  
  

• B、False
  
  

• C、Not Given
  
  

Task 1

16.Paragraph     ①   

17.Paragraph     ②   

18.Paragraph     ③   

19.Paragraph     ④   

20.Paragraph    ⑤  

A. Rich Resources of the State

B. Connections With the Outside World

C. Transportation Problem

D. The Natives of the Land

E. Position and Cold Climate

F. Land and Population