PTE考生目前最大的问题之一就是练习题缺乏。除了有限的基本官方书（PLUS，Testbuilder, OG）之外，就没有题了。很多英语基础不是很扎实的同学很难找到练习材料。墨尔本文波雅思PTE培训学校专门为墨尔本，悉尼PTE考生准备了适合PTE听力阅读练习的科学60秒。各位PTE同学可以练习PTE听力中的summarise spoken text和PTE口语中的retell lecture，PTE听力口语-科学60秒-Frosty Moss练习记笔记技巧和复述。废话少说，下面开始：
60秒科学：Dainty Diet Dictated Big-Feline Decline
60秒科学节目（SSS）是科学美国人网站的一套广播栏目，英文名称：Scientific American – 60 Second Science,节目内容以科学报道为主，节目仅一分钟的时间，主要对当今的科学技术新发展作以简明、通俗的介绍，对于科学的发展如何影响人们的生活环境、健康状况及科学技术，提供了大量简明易懂的阐释。
Starting about 12,000 years ago, many species of North American animals began to die out. The episode is called the late Pleistocene extinction. And it killed off four of the six kinds of American big cats. Only cougars and jaguars survived. Now researchers say the other felines’ diets may have been their doom.
The clues are found on fossil teeth. Gnawing on brittle bones, for example, leaves different marks than chewing tender meat.
So researchers compared the teeth of cougars to those of American lions and saber-toothed cats that did not make it. For context, they also analyzed the marks on the teeth of modern carnivores with known diets, including cougars, lions and hyenas. The study is in the journal Biology Letters. [Larisa R. G. DeSantis and Ryan J. Haupt, Cougars’ key to survival through the Late Pleistocene extinction: insights from dental microwear texture analysis]
During tough times, both ancient and modern cougars consumed almost all of their prey—including the bones. But the cats that went extinct stayed picky, eschewing rather than chewing some body parts even when food was scarce. So next time you’re faced with finicky eaters, tell them why there are no more saber-toothed cats.