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。
This is Scientific American — 60-Second Science. I’m Christopher Intagliata.
Ebola outbreaks before the most recent one have been fairly contained: geographically limited, and just a couple hundred cases. The latest outbreak, though, which started in late 2013 and lasted more than two years, was entirely different. “There were almost 30,000 cases.” Jeremy Luban, a virologist at the University of Massachusetts Medical School. “You could argue this was the first actual epidemic.”
Luban and his colleagues studied publicly available data on the evolutionary “family tree” of the Ebola virus during the latest outbreak—how the strains mutated and changed over time. “And one in particular caught our attention. It arose early in the epidemic, and it’s the only form of the virus that persisted beyond that point.”
This mutant strain was armed with an alteration in the protein it uses to enter cells. What Luban’s team found was that the modified protein actually made the strain more infectious to the cells of humans and other primates—but not to other mammals. The study is in the journal Cell.
Luban says it’s unclear whether this increased infectivity helped drive the outbreak to epidemic proportions. Or whether the length and size of the epidemic simply allowed for more virulent strains like this one to appear. Still, he says, studying these strains helps us understand how the virus infects—and replicates. “That may help us treat infections in the future, to develop therapies, or to develop vaccines to block an infection.” In other words: know thy enemy.
Thanks for listening for Scientific American — 60-Second Science Science. I’m Christopher Intagliata.
墨尔本悉尼文波PTE原创首发
更多精彩请持续关注微信wenbo_tv2。
