有關(guān)英語(yǔ)六級(jí)閱讀備考技巧
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
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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