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  3. Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blo

Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blo

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问题     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 evolved on land should have returned to the sea. Those that did do that have flourished. Within about 50 million years—no time at all, geologically speaking —one of the four kinds of mammals that has 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. At sea, as on land, humans have now positioned themselves on top of the whole great pyramid of life, and they have caused serious problems for the mammals of the sea.
    There is a simple reason for this. Marine mammals have the misfortune to be swimming aggregates of commodities that humans want: fur, oil, and meat. Even so, they might not be so vulnerable to human depredation if they did not, like humans, reproduce so slowly. Every year humans take more than 50 million tons of fish from the oceans without critically depleting the population of any species. But the slow-breeding mammals of the sea have been all but wiped out by humans seeking to satisfy their wants and whims.
Which of the following statements about marine mammals best expresses the main idea of the passage?
选项 A、They have their origins on land.
B、They have evolved successfully but are now threatened by humans.
C、They compete with one another for the ocean’s food supply.
D、They have many of the biological traits of humans.
答案B
解析 根据文章内容可知，B项表述符合文章观点，即海洋哺乳动物在海洋里繁殖得很成功，但近150年来遭到了人类的威胁。其他三项表述均不符合本文观点或内容。据此判断，答案是B。
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