50 The purpose for the author to mention the “great trade route” is to explain ____ .
(A) the Vikings’ interests in transportation
(B) the prosperity of Frisia
(C) the beginning of commercial exchange in northern Europe
(D) the adventure spirit of the Vikings
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統計: A(9), B(17), C(50), D(17), E(0) #1121023
統計: A(9), B(17), C(50), D(17), E(0) #1121023