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:Bio-Battery Produces Power from Your Perspiration


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。

Do you like working up a sweat? Or do you feel like maybe sweat should work for you? Well, hold on to your sudoriferous glands. Because researchers have designed a device that could someday produce power from your perspiration. The schvitzy scheme was presented at the annual meeting of the American Chemical Society in San Francisco. [Wenzhao Jia et al, Epidermal Biofuel Cells: Energy Harvesting from Human Perspiration, in Angewandte Chemie]

Strenuous exercise generates lactate—the molecule that makes overworked muscles burn. Athletes sometimes evaluate their fitness by checking the lactate levels in their blood. To reduce blood draws, researchers came up with a monitor that could measure the lactate in sweat. The device they designed strips electrons from lactate, which creates a small electric current. The strength of the current reveals the amount of lactate.

To test the system, 10 volunteers wore the arm-patch sensor while they rode a stationary bike. And the device recorded the current they delivered as they dripped.

Then the researchers thought, what if they could tap into this energy to develop a sort of sweat-powered “bio battery?” Their proof-of-concept setup topped out at only about 4 microWatts of juice—not even enough to run a watch. But with better electronics, exercising in the future could make dirty clothes and some clean energy.

—Karen Hopkin


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