【題組】18. According to the passage, European conquerors had which of the followingadvantages in North America?
(A) They possessed a larger population to replace casualties in their conquest ofNorth America than they did in the South.
(B) They had already gained experience in the Southern conquest that was notformerly available.
(C) They had better martial organization in North America than they had in SouthAmerica.
(D) They were confronted by an opponent experienced in empire-building in NorthAmerica.