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11. A new study on birds sleep has revealed that ____________.
A) half-brain sleep is found in a wide variety of birds
B) half-brain sleep is characterized by slow brain waves
C) birds can control their half-brain sleep consciously
D) birds seldom sleep with the whole of their brain at rest
12. According to the passage, birds often half sleep because ______________.
A) they have to watch out for possible attacks
B) their brain hemisphere take turns to rest 跨段
C) the two halves of their brain are differently structured 沒(méi)
D) they have to constantly keep an eye on their companions 反
13. The example of a bird sleeping in front of a mirror indicates that _____________.
A) the phenomenon of birds dozing in pairs is widespread
B) birds prefer to sleep in pairs for the sake of security
C) even an imagined companion gives the bird a sense of security
D) a single pet bird enjoys seeing its own reflection in the mirror
14. While sleeping, some water mammals tend to keep half awake in order to __________.
A) alert themselves to the approaching enemy
B) emerge from water now and then to breathe
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