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：
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。
The news last month that gravitational waves had been discovered made waves throughoutthe world of science.
The finding, from the Laser Interferometer Gravitational–Wave Observatory, or LIGO, showedthat extreme gravity can cause ripples in spacetime.
In the case studied, the extreme gravity came from two colliding black holes.
Now one scientist is suggesting an added wrinkle—that those two black holes might haveoriginated in a single star.
“The situation is similar to a pregnant woman that has twin babies in her belly.”
Avi Loeb of the Harvard–Smithsonian Center for Astrophysics.
He’s proposing the idea in a paper that’s been accepted for publication in the AstrophysicalJournal Letters.
Loeb became suspicious because just 0.4 seconds after LIGO spotted the gravitationalwaves, a space telescope called Fermi glimpsed a bright flash of gamma–ray light in the samearea of the sky.
“Detecting such a signal is quite surprising from a collision of two black holes.
What could be the source of a flash of light following a black hole merger?”
Colliding black holes should not produce such light—but the death of a very massive starcould.
“My idea was that if the star is spinning very rapidly to start with, then as its core collapses itproduces a bar that breaks into two clumps of matter, sort of like a dumbbell configuration.And these two clumps of matter orbit a common center, and they eventually collapseindependently into two black holes.”
Of course, it’s possible that the Fermi telescope signal was a false alarm.
So we’ll see if future gravitational wave detections are also accompanied by flashes of light—supporting the idea that twin black holes collided upon the collapse of a massive star.
