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，练习记笔记技巧和复述。废话少说，下面开始：
Caimin In, the Water’s Fine
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。
Fossil caiman skulls found in Panama raise questions about the distance between South and Central America at the beginning of the Miocene epoch. Sophie Bushwick reports
It was thought that saltwater seas separated Central and South America millions of years ago. But a recent discovery may render that idea all wet. Because archaeologists in Panama have dug up the remains of ancient alligator relatives—which were freshwater creatures. The work is in the Journal of Vertebrate Paleontology. [Alexander K. Hastings et al., Systematics and biogeography of crocodylians from the Miocene of Panama]
Excavations at the Panama Canal have turned up many fossils. Recently, two partial skulls were found embedded in rocks that date back more than 19 million years, which makes them the oldest crocodilian fossils ever found in Central America. The skulls are from two species of the freshwater reptiles called caimans. Modern caimans are related to North American alligators but live only in South America.
To reach Panama, the caimans must have left South America around the beginning of the Miocene epoch, when ocean separated the two continents. These freshwater animals should only have been able to cross a short expanse of saltwater. So at the time, Central and South America may have been much closer than we thought. Either that, or those caimans hitched a ride.