試題詳解

36. In Paragraph 1, why do the authors include the information that the Alleghany mountains serve as a kind of boundary to the frontier?
(A) To make a statement about geo-politics
(B) To show how brave and unique Daniel Boone was since he lived beyond it.
(C) As a commentary on the relative bravery of frontiersmen.
(D) To show the pros and cons of different areas for living and exploring.