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:

60秒科学:Biodiversity Survives Extinctions For Now


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。

We are living during what seem to be the opening stages of the sixth mass extinction in our planet’s 4.5 billion year history. Species of birds, fish, mammals and plants are disappearing at speeds rarely experienced, thanks in large part to human activities: pollution, climate change, habitat destruction and other damage. But extinction apparently does not mean less biodiversity—at least not yet.

A new look at ecosystems from the poles to the tropics shows that losses in the number of species in any given place do not yet translate to large changes in the overall number of different species there. The study is in the journal Science. [Maria Dornelas et al, Assemblage Time Series Reveal Biodiversity Change but Not Systematic Loss]

The researchers analyzed 100 surveys that followed more than 35,000 different species over various lengths of time. These long-term studies found that the number of different species in, say, a coral reef remains relatively constant. Because the loss of a species, either locally or entirely, is often balanced by the arrival of a new species.

The meta-analysis showed that 40 percent of places had more species present, 40 percent had less and 20 percent were unchanged. In other words, the ecosystems of the current Anthropocene era are transformed, but just as diverse—so far anyway. We are living in a world of novel ecosystems.

—David Biello


您的电子邮箱地址不会被公开。 必填项已用*标注