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：
60秒科学：Heat Is on These Countries for the Heat
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。
Atmospheric carbon dioxide levels have now touched 400 parts per million°™and keep rising. So who’s responsible?
Scientists peg the start of this seemingly inexorable rise to about 1750, when people started burning coal to run steam engines. But the CO2 increase also stems from activities like clearing forestlands for farming.
Now a new analysis assigns national blame for CO2 pollution and its ensuing global warming.
The seven biggest contributors°™both historically and today°™are, in alphabetical order: Brazil, China, Germany, India, Russia, the United Kingdom and the United States. The report is in the journal Environmental Research Letters. [H. Damon Matthews et al., National contributions to observed global warming]
The undisputed champion of greenhouse gas pollution is no surprise: the U.S. Our emissions to date mean we’re responsible for 0.15 degree Celsius of the 0.8 degree Celsius rise in global average temperatures: 19 percent of the total. That’s more than twice as much as the next highest country, China. The worst polluting country per person? The tiny U.K.
Unfortunately, China looks set to pass the U.S., unless their reliance on coal changes in short order. As for us, after several years of our greenhouse gas pollution falling, CO2 emissions rose again in 2013. Here’s one area in which the U.S. shouldn’t want to lead.