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。
Connecting your computer to the Internet giveswould–be spies an obvious entry point to your machine.
But other ways exist to snoop.
Because even computers that aren’t connected tothe Internet broadcast their activity in the form of electromagnetic radiation.
Basically your computer is full of transistors.
And they’re switching current from high to low depending if it is a zero or a one of the bit that they’re trying to execute.”
Alenka Zajic, an electrical engineer at Georgia Tech.
“When you do that you’re creating a voltage fluctuation and current fluctuation.
And that basically creates electromagnetic field.”
By hooking an antenna and receiver up to a laptop, Zajic and her colleagues were able to log the keystrokes of a computer in the next room, by measuring exceedingly tiny fluctuations inthe computer’s radiation.
The same technique can reveal which programs you’re using, too.
Every one of them has a different signature in electromagnetic fields.
So I can tell which application you opened by looking into the spectrum.
The researchers quantified the signal available to eavesdroppers in a recent paper, presentedat the IEEE/ACM International Symposium on Microarchitecture in the U.K.
Of course, real spies at the NSA and the CIA probably already know about this trick, she says.
But by alerting developers to the problem, it might be possible to mask these electromagnetic leaks.
And keep your computer’s activity to yourself.
antenna： [æn’tenə] n.天线
spectrum：[‘spektrəm] n. 光谱
electromagnetic：[ɪ,lektrə(ʊ)mæg’netɪk] adj.电磁的
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