句间停顿:
  • 1S
  • 3S
  • 5S
语速: x 1.0
  • 速度0.8X
  • 速度1.0X
  • 速度1.2X
  • 速度1.5X
  • 速度1.8X
  • 速度2X
始终显示原文
欢迎使用 KMF 精听精研
坚持练习精听,反复听、吃透每个句子,能够快速 提升听力能力
开始精听
或按 「 空格」开始播放

段落1

This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

点击显示原文

隐藏原文=

Roosters greet the rising sun with.

点击显示原文

隐藏原文=

But they also crow at other times.

点击显示原文

隐藏原文=

So are they responding to the light?

点击显示原文

隐藏原文=

Or do they simply know that it's morning?

点击显示原文

隐藏原文=

New research says the latter: roosters crow because of internal time cues.

点击显示原文

隐藏原文=

The finding is in the journal Current Biology.

点击显示原文

隐藏原文=

Scientists controlled the light levels in rooster habitats.

点击显示原文

隐藏原文=

For two weeks, the birds experienced 12 hours of light followed by 12 hours of dim light.

点击显示原文

隐藏原文=

Consistent with the pre-dawn noises observed in wild fowl, the roosters began to crow about two hours before their rooms lit up.

点击显示原文

隐藏原文=

Then, for two weeks, the roosters lived in constant dim light.

点击显示原文

隐藏原文=

Yet they continued to crow about once a day--at intervals of 23.7 hours to be precise.

点击显示原文

隐藏原文=

Even without morning light, their circadian rhythms told them when dawn should be breaking.

点击显示原文

隐藏原文=

The birds also crowed in response to sudden light, and to the sounds of other roosters.

点击显示原文

隐藏原文=

But they were more likely to react when those stimuli occurred near dawn.

点击显示原文

隐藏原文=

Showing that you can't really keep a rooster in the dark about the time.

点击显示原文

隐藏原文=

Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

点击显示原文

隐藏原文=
[ < 空格 > ]
当前句 /
/
  • 段落1
  • 第 1 句
  • 第 2 句
  • 第 3 句
  • 第 4 句
  • 第 5 句
  • 第 6 句
  • 第 7 句
  • 第 8 句
  • 第 9 句
  • 第 10 句
  • 第 11 句
  • 第 12 句
  • 第 13 句
  • 第 14 句
  • 第 15 句
  • 第 16 句
  • 第 17 句

+ 创建收藏夹
保存 取消