PTE听力口语练习-科学60秒-Florida citrus crop

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:


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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。
Ten years ago, a bacterial disease began to eat away at the Florida citrus crop.
It’s called huanglongbing, or citrus greening, and it causes misshapen, bitter green fruits and,eventually, dead trees.
Since 2005, the infection is estimated to have caused billions of dollars in damage.
And the microbe did all that damage with the unwitting help of a tiny winged insect, the citruspsyllid, which spreads the bacterium as it feeds.
But now researchers at the USDA and the University of Florida have come up with a pesticidefree way to battle the insect:by disrupting its ability to find a mate.
When male psyllids are looking for love, they beat their wings, sending vibrations along a tree’sbranches.
Nearby females pick up that signal and send back one of their own, which tells males to comehither.
The researchers eavesdropped on that duet with a microphone, rigged to an electronicmicrocontroller.
And when the controller identified a male’s call, it sent out a decoy female responsemorequickly than real females could respond.
That imposter’s call actually lured males to the device, where instead of a mate they foundflypaper.
The researchers presented the results at a meeting of the Acoustical Society of America, inJacksonville, Florida.
The technique isn’t ready for the limelight just yet.
For one, though the decoy call does fool the bugs, they’re still adept at avoiding the flypaper.
But the researchers say this sort ofsignal jamminginterference might be able to disruptthe insects’ ability to find a mate, cutting overall numbers of the pest.
A similar technique has worked in vineyardsand if it works in orange groves, it could helpcitrus growers get out of this squeeze.

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