4 What is the major function of EEG?
(A)It traces animals’ whereabouts.
(B)It reveals a lot of animal bio-data.
(C)It gives warning to animals when there are enemies.
(D)It helps animals to sleep well.

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統計： A(26), B(300), C(22), D(26), E(0) #1188232

詳解 (共 1 筆)

#3617478
 All animals must rest, but do other animals sleep as human beings do?
Observations觀察 of animal behavior alone cannot fully answer the question.
For example, some fish and snakes never close their eyes whether they are awake or asleep.
Elephants may sleep standing up, with their trunks象鼻 resting in the fork分岔處 of a tree. 
      The answers may come from experiments in laboratories實驗室 using a machine called the electroencephalograph(EEG)腦電圖.
The machine is connected to animals and measures their brain signals, breathing, heartbeats, and muscleactivities.
Using the EEG, scientists have confirmed that all birds and mammals studied in the laboratories do sleep.
There is some evidence that reptiles爬行動物, such as snakes and turtles, do not truly sleep, although they do have periods of rest each day, in which they are quiet and unmoving.
They have also discovered that some animals, like chimpanzees, cats, and moles鼴鼠, are good sleepers while others, like sheep, goats山羊, and donkeys, are poor sleepers.
Interestingly有趣的是, the good sleepers are nearly all hunters with resting places that are safe from their enemies.
Nearly all the poor sleepers are animals hunted by other animals; they must be watching for enemies, even when they are resting.
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