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：
If the Fuel Source Ain’t Clean, Your Electric Car Ain’t Green
听力内容：
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。
As Tesla prepares to begin selling its Model S in smog-ridden China, the question is: do electric cars reduce air pollution? And the answer is: it depends.
That on-the-one-hand-yes-but-on-the-other hand-no conclusion comes from a study predicting the impacts of electric cars in the U.S. to 2050. It’s in the journal Environmental Science and Technology. [Samaneh Babaee, Ajay S. Nagpure, and Joseph F. DeCarolis, How Much Do Electric Drive Vehicles Matter to Future U.S. Emissions?]
The reason it depends is that we don’t know the future. Will batteries be cheap? Will the U.S. have a law limiting carbon dioxide? Which will cost less: oil or natural gas?
Depending on the answers, electric vehicles and hybrids might not reduce air pollution at all. They could even make it worse.
Researchers ran 108 different computer models of how driving might change in the next few decades. And it turns out the key to reducing air pollution isn’t how many electric cars there are. What matters is whether there are regulations in place to mandate reductions in CO2 and other pollutants.
As it stands, battery cars that run on electricity from burning coal can be more polluting than cars that get good mileage on gas. And that’s why a Tesla in China, where most electricity comes from coal, is no zero-emissions vehicle.
–David Biello
