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 Erika Beras.
It’s easy to see that some plants change from day to night—flowers open and close, and eventurn to face the sun. In 1880 Darwin noted that the leaves and seedlings of various plantsappeared to engage in nighttime changes that he called sleep. But there’s now evidence thatsome entire trees may have their own version of sleep, which lets them recharge for thefollowing day. That’s according to a study in the journal Frontiers in Plant Science.
Researchers used lasers to scan birch trees in both Finland and Austria. They found that thebranches drooped by as much as four inches at night compared with daytime.
And exposure to the elements was not responsible—the trees were surveyed from sunset tosunrise over enough time to rule out the changes being caused by wind or other externalenvironmental factors.
The researchers have a couple of ideas about what’s causing the branches to slouch. One isthat the fluid pressure inside the tree decreases—something like dehydration.
The other proposal is that the trees are actually engaged in a botanical version of sleep. During the daylight hours the leaves perk upwards to get more sun, but with no chance to catchrays at night, they relax. And even before the sun rose, some branches were found to bereturning to their daytime position—as the researchers say, perhaps governed by their internalcircadian clock in preparation for a new day of light gathering.
But unlike us, there’s no evidence that trees sleep in on the weekend.
Thanks for listening for Scientific American — 60-Second Science Science. I’m Erika Beras.
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