______to some parts of South America is st
题型：单项选择题
问题：
______to some parts of South America is still difficult, because parts of the continent are still covered with thick forests.
A． Orientation
B． Access
C． Procession
D． Voyage
______to some parts of South America is still difficult, because parts of the continent are still covered with thick forests.
A． Orientation
B． Access
C． Procession
D． Voyage