【单选题】听力原文: I spoke yesterday about the construction of ancient Viking ships. Today I'd like to discuss the transocean voyages that the Norse made in these open boats-voyages made without compasses or chart...
A.
Life in Norway during Viking(海盗)times.
B.
Different ocean routes taken by the Vikings.
C.
Methods used in Viking navigation.
D.
The importance of migrating geese in Viking navigation.