媒体英语 Mysteries of elephant sleep revealed 科学家揭开大象的睡眠模式之谜

Play audio file 文字稿 一项研究表明，非洲野象是睡眠时间最短的哺乳动物。一组科学家在非洲南部国家博茨瓦纳追踪记录了两只大象在自然环境中的睡眠规律。在动物园中笼养的大象每天睡四到六个小时，然而生活在野外的大象只休息两个小时，大多在夜晚入睡。请听 Helen Briggs 的报道。

Scientists tracked two elephants roaming across Botswana to find out more about the animals' sleeping habits. Elephants in captivity sleep for four to six hours a day, but it's always been suspected this might be different in the wild.

In fact, in their natural surroundings, the elephants slept for only two hours, mainly at night. The elephants, both matriarchs of the herd, sometimes stayed awake for days at a time, and they travelled long distances, perhaps to escape lions or poachers. And they only went into rapid eye movement or 'dreaming sleep' every three or four days.

Sleep plays a big role in memory. It's a mystery why an animal known for its incredible memory powers can survive on power naps alone.

词汇表 roaming 漫步，闲逛

in captivity （动物）被笼养

natural surroundings 自然环境

matriarchs （兽群中的）母系首领

herd 兽群，文中指象群

poachers 偷猎者

rapid eye movement 睡梦中眼部的快速运动，属于睡眠周期中的一个阶段，简称 REM

power naps （用短时间来恢复能量的）小睡

测验 请听报道并回答下列问题。

1. How many hours a day do elephants in captivity sleep? 

2. Why did the elephants travel long distances, according to the text?

3. True or false? The two elephants are both female leaders of the herd.

4. Which word in the text means 'regularly repeated behaviours or practices'?

答案 1. How many hours a day do elephants in captivity sleep?

Elephants in captivity sleep for four to six hours a day. 

2. Why did the elephants travel long distances, according to the text?

According to the text, the elephants travelled long distances, perhaps to escape lions or poachers.

3. True or false? The two elephants are both female leaders of the herd.

True. Both elephants are matriarchs of the herd, and the word 'matriarch' here means 'the most powerful female of a group of family'.

4. Which word in the text means 'regularly repeated behaviours or practices'?

Habits.

【Mysteries of elephant sleep revealed 科学家揭开大象的睡眠模式之谜】相关文章：

★ Pregnancy alters woman's brain 'for at least two years' 初次怀孕对女性大脑的影响“至少持续两年”

★ 球员抑郁和焦虑

★ Charge, fee, fare, cost 四个与“价格、费用”相关的单词

★ 大学生活的小测验

★ Metonymy and synecdoche 修辞法：转喻和提喻

★ Giraffes' decline; female bullfighter 长颈鹿数量骤减，西班牙女斗牛士

★ Driverless cars 无人驾驶汽车

★ Family, house and home 和家有关的三个词

★ Orangutan squeaks reveal language evolution, says study 科学家称红毛猩猩叫声揭示人类早期语言进化过程

★ Light pollution dampens urban robins' song 城市光污染抑制知更鸟的鸣唱