PTE听力口语练习素材:科学60秒- Polar Bear

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:Polar Bear Rapid Evolution Lets Them Be Fat Fit


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。

A triple bacon cheeseburger seems like a heart attack on a plate. So how can polar bears thrive on their version, seal blubber? Turns out they’ve stocked up on genes that let them clear fats from their blood. That’s according to a study in the journal Cell.

Polar bears are well adapted to life on the sea ice. Up to half their body weight’s fat, which gives them extra insulation and buoyancy, and provides them with a ready source of energy.

But how can an animal so fat also be so fit? Researchers compared the genomes of polar bears with those of brown bears, and found that polar bears have accumulated genetic changes that boost their heart health and fat metabolism. One gene in particular, called ApoB, helps move cholesterol out of the blood where it causes problems in humans and into cells.

These genomic changes happened quickly, evolutionarily speaking. Polar bears and brown bears diverged from a common ancestor less than half a million years ago. But if that seems super speedy, the ability to digest lactose didn’t spread through human populations until we domesticated cows, just 10,000 years ago. A moooving testament to the power of natural selection.

–Karen Hopkin


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