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。
Our smartphones, tablets, laptops—they all compute things electronically. But, think outsidethat silicon box for a second: “There’s nothing special about electrons and using silicon aspart of computing.” Chris Voigt, a bioengineer at M.I.T.. “You can do computing with anynumber of things.” Including, he says, DNA.
“Cells do computing all the time. So they’re constantly trying to interpret their environmentand be able to turn on different genes and respond to it.” And those genes in a cellularcircuit are like the logic gates, the memory, and other systems found in conventionalcomputers.
So Voigt and his colleagues created what he calls the first human–made “programminglanguage” for living cells. It’s an open–source design environment called “Cello.” Just writewhat you want the cell to do, and Cello spits out the DNA sequence—as if you were compilingcode. The researchers used the platform to design 60 genetic circuits, which they then raninside E. coli bacteria. Many of these DNA–based circuits allow bacteria to senseenvironmental data – like levels of oxygen or glucose in the gut – and respond in various ways.They detail the findings in the journal Science.
Not all the circuits worked as intended. A quarter of them failed, and some were toxic to thecells. But the idea is to make cellular circuit design easier—and more approachable—tocreative people. “When I was a graduate student I had a computer file for Microsoft Word thathad all my favorite pieces of DNA. And I would have to sit there and stitch it together and tryto remember how each one worked, and constantly run programs to try to look for mistakes.”
Cello takes care of all that. And now, Voigt says, biology is right about where electricalengineering was in the early 80s: ready for a computing revolution.
