2024年6月英语六级听力长线备考：Marine Mammals

2024-01-08 08:25:00来源：网络

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　　都说英语六级听力很难，而且六级听力分值又很大，要想顺利考过六级就必须要解决听力，英语六级听力怎么提高?新东方在线汇总了“2024年6月英语六级听力长线备考：Marine Mammals”，帮助大家更好地做好考前复习。

　　2024年6月英语六级听力长线备考：Marine Mammals

　　1.Why does the autnor think some mammals should have returned to the sea? Because there is ... in the sea.

　　2.What do humans want to get from marine mammals? Fur, ... and ...

　　3.Which mammals in the sea have almost been wiped out by humans? Those ... mammals.

　　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 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 the 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.

　　以上就是“2024年6月英语六级听力长线备考：Marine Mammals”，希望可以给大家在学习的时候带来帮助。

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