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。悉尼文波雅思PTE培训学校专门为澳洲，尤其是悉尼、墨尔本的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：
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。
They’re called button cells, coin cells or watch batteries.
By any name, these tiny, round batteries pose a choking danger to small kids.
And if a child succeeds in swallowing a button cell, the battery may short-circuit in the moist esophageal environment, burning the tissue.
A few thousand kids wind up in emergency rooms each year after swallowing a button battery.
But a team of Harvard and M.I.T. researchers that includes prolific inventor Robert Langer thinks they have a partial solution: a protective coating.
The scientists covered batteries with a material—technically a quantum-tunneling composite—in which microparticles of conductive metal are suspended in an insulating layer.
Under most circumstances, including inside of a child, the layer is nonconductive.
But when the material is subjected to high pressure, the microparticles are squeezed close enough together to carry a current.
One such pressurized environment is the typical battery compartment in a small device—you often have to force the battery into place.
So the same battery that remains inert when swallowed works just fine when it’s jammed into its slot in a hearing aid.
The waterproof design would also protect batteries from corrosion in high humidity.
The research is in the Proceedings of the National Academy of Sciences USA.
Tests with pigs found the coated batteries to be gentle on the porcine esophagus.
Next step: figure out a way to keep kids from putting the batteries in their mouths in the first place.
Can a quantum tunneling composite be made to taste terrible?
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