请听下面一段材料，回答第1-4题。

1. What is the talk mainly about?

A. Benjamin Franklin’s contribution to the postal service of the US.
B. How the postal service developed in the US.
C. How the first postal service started in the US.

2. Where was the first postal service established in the US?

A. In Philadelphia      
B. In Delaware    
C. In Boston

3. For what did Benjamin Franklin deserve most credit?

A. He established a government service.
B. He established the permanent postal system in the US.
C. He developed a system called “star routes”.

4. How was mail delivered to the remote areas out in the west?

A. By boat            
B. By train          
C. By horse and wagon