【題組】49. The passage supplies information for answering which of the following questions?
(A)What varieties of plant seeds are birds that fly long distances most likely toswallow?
(B)What is a reason for accepting the long-distance dispersal of plant seeds as anexplanation for the origin of Hawaiian flora?
(C)Why does successful long-distance dispersal of plant seeds require anequivalence between the ecology of the source area and that of the recipientarea?
(D)Why are more varieties of plant seeds adapted to external rather than to internalbird transport?