[单项选择] Origin of Vegetable and Animal Life in America When the new world was first discovered, it was found to be, like the old, full of plants and animals, and a great many tribes and nations of men lived there. Yet the plants and animals, if not the men, were all essentially different from those known in the old world. This was unexpected; it was thought to be quite remarkable. Then a question arose, what is the origin of these plants and animals and men How could they come to a continent that is cut off apparently from all intercourse (交流) and connection with the rest of the world For the American continent is entirely separated from the old. The nearest approach to it is at Behring’’sStraits (白令海峡), on the north-west, where it is divided from the Asiatic continent by a channel about forty miles wide. Means of Communication with the Old World Some animals and perhaps some plants, and most certainly men, may be supposed to have been transported across such
A. Y
B. N
C. NG