[单项选择]Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blooded mammals(哺乳动物) that evolved on land should have returned to the sea. Those that did have flourished. Within about 50 million years — no time at all, geologically speaking — one of the four kinds of mammals that have returned to a marine environment has developed into the largest of all animal forms, the whale. A second kind, the seal, has produced what is probably the greatest population of large carnivorous mammals on Earth.
This suggests that these "top dogs" of the ocean are prospering and multiplying. However, such has not been the case, at least not for the last 150 years. Trouble has closed in on these mammals in the form of equally warm-blooded and even more efficient and adaptable predators, humans.Which of the following commodities is not the commodity that human wants in this article
A) Fur. C) Oil.
B) Bone.

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[单项选择]Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blooded mammals that (67) on land should have returned to the sea. Those that (68) have flourished. Within about 50 million years-- (69) time at all, geologically speaking--one of the four kinds of mammals that has (70) to a marine environment has developed into the largest of all animal (71) , the whale. A second kind, the seal, has produced what is probably the greatest population of large carnivorous mammals on Earth.
This suggests that these "top dogs" of the ocean are (72) and multiplying. (73) , such has not been the case, at ieast not for the last 150 years. Trouble has closed in (74) these mammals in the form of equally warm-blooded and even more (75) adaptable predators, humans. At sea, (76) on land, humans have now (77) themselve
A. processing
B. proceeding
C. prospering
D. prospecting

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