PTE听力口语练习-科学60秒-Internal Clocks

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:

Internal Clocks Tell Roosters It’s Crow Time


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。

Circadian rhythms tell fowl to crow at dawn, even if the birds can’t see the sun come up. Sophie Bushwick reports


Roosters greet the rising sun with [crowing sound effect]. But they also crow at other times. So are they responding to the light? Or do they simply know that it’s morning? New research says the latter: roosters crow because of internal time cues. The finding is in the journal Current Biology. [Tsuyoshi Shimmura and Takashi Yoshimura,Circadian clock determines the timing of rooster crowing]

Scientists controlled the light levels in rooster habitats. For two weeks, the birds experienced 12 hours of light followed by 12 hours of dim light. Consistent with the pre-dawn noises observed in wild fowl, the roosters began to crow about two hours before their rooms lit up.

Then, for two weeks, the roosters lived in constant dim light. Yet they continued to crow about once a day—at intervals of 23.7 hours to be precise. Even without morning light, their circadian rhythms told them when dawn should be breaking.

The birds also crowed in response to sudden light, and to the sounds of other roosters. But they were more likely to react when those stimuli occurred near dawn. Showing that you can’t really keep a rooster in the dark about the time.

—Sophie Bushwick


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