48. It can be inferred from information in the passage that the existence in alpine regionsof Hawaii of a plant species that also grows in the southwestern United States wouldjustify which of the following conclusions?
(A) There are ocean currents that flow from the southwestern UnitedStates to Hawaii.
(B) The plant species discovered in Hawaii must have traveled from the第 9 頁，共 9 頁southwestern United States only very recently.
(C) The plant species discovered in Hawaii reached there by attaching to thefeathers of birds migrating from the southwestern United States.
(D) The ecology of the southwestern United States is similar in important respectsto the ecology of alpine regions of Hawaii.