新东方在线网络课堂 六级 新东方在线 > 六级 > 英语六级听力 > 正文

2018年6月英语六级听力常考时文:Marine Mammals

2018-04-16 15:57:46 来源:网络六级资料下载

英语六级资料大全下载英语六级资料大全下载

六级关注: 六级语法常考知识讲解汇总 六级仔细阅读练习题库 六级真题高频词汇带音标

备考指导: 六级高频单词分类盘点 英语六级口语练习6类话题 英语六级核心词汇汇总

热点推荐: 六级口语考试单词复习汇总 六级基础语法知识汇总 六级听力常考句式及短语

六级必过: 英语六级听力短文汇总 六级口语常用句型汇总 英语六级长篇阅读练习题

  2018年6月英语六级听力常考时文盘点

  英语六级听力常考时文: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.

  2018年6月英语六级听力常考时文盘点

英语六级必备资料下载

2018年6月英语六级词汇完整版带音标下载

英语六级必备工具:测测你的词汇量能过六级吗

测测你的词汇量能过六级吗

本文关键字: 英语六级听力 六级听力备考

分享到:

课程试听换一换

  • 大学英语六级通关全程3班【2018年12月】

    ¥199

相关推荐

四六级交流•下载

精品课限量免费领

今日特价课

六级实用•工具

六级课程排行榜本周本月

六级公开课更多>>

2018年6月大学英语六级考试真题(第一套) w 29分52秒
1 2018年6月大学英语六级考试真题(第一套)
2017年12月大学英语六级考试真题(第二套) w 27分25秒
2 2017年12月大学英语六级考试真题(第二套)
2017年12月大学英语六级考试真题(第一套) w 27分51秒
3 2017年12月大学英语六级考试真题(第一套)
2018年6月六级写作真题解析-王兆飞 w 11分22秒
4 2018年6月六级写作真题解析-王兆飞
2018年6月六级阅读真题解析-舒洋 w 15分40秒
5 2018年6月六级阅读真题解析-舒洋

微博直播更多>>

推荐阅读