2020年6月大学英语六级阅读晨读美文：Marine Ma妹妹als
【文章简介】没有被熬煎的醒悟，就没有向前冲的资格。既然选择了，就算要跪着也要走上来。实在偶然候咱们还没做就被咱们考生自己吓退了，想要往前走，就不要思量太多，去做就行了。以下为“2020年6月大学英语六级阅读晨读美文：Marine Ma妹妹als”，接待阅读参考！更多有关讯息请关注华宇考试网！
Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blooded ma妹妹als 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 ma妹妹als 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 ma妹妹als 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 ma妹妹als 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 ma妹妹als of the sea. There is a simple reason for this. Marine ma妹妹als have the misfortune to be swi妹妹ing aggregates of co妹妹odities 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 ma妹妹als of the sea have been all but wiped out by humans seeking to satisfy their wants and whims.