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，练习记笔记技巧和复述。废话少说，下面开始：
Milky Way May Contain 100 Billion Planets
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。
Based on exoplanet observations made using the Kepler space telescope, astronomers estimate that our galaxy’s ratio of stars to planets is at least one to one. Karen Hopkin reports
[Carl Sagan speaking:] “There are in fact 100 billion galaxies, each of which contains something like a 100 billion stars.” Well, Carl Sagan would have loved to get the latest estimate of our galaxy’s planet count.
Caltech astronomers set their sites on a star called Kepler 32. It’s an M dwarf star, a class that’s smaller and cooler than our sun, and accounts for about three quarters of the stars in the Milky Way. But what’s really cool about this particular star, from the astronomers’ point of view, is that its five planets orbit in a plane that the Kepler telescope sees edge on. So the star’s light dims each time a planet passes between it and the scope, which makes the planets easier to detect.
Now, taking into account the percentage of M dwarf systems that lie in a similar edge on orientation, and the number of planetary systems the Kepler telescope has already detected, the researchers figure our galaxy is host to at least 100 billion planets. Their calculations are served up in The Astrophysical Journal. [Link to come.]
Many of those planets may be the size of Earth. But we’re the only planet that produced Carl Sagan.