A new study on birds’ sleep has revealed that ________.

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• 1According to the passage, birds often half sleep because ________.

  A.they have to watch out for possible attacks

  B.their brain hemispheres take turns to rest

  C.the two halves of their brain are differently structured

  D.they have to constantly keep an eye on their companions

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• 2The 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

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• 3While 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

  C.be sensitive to the ever changing environment

  D.avoid being swept away by rapid currents

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• 4By “just the tip of the iceberg” (Line 2, Par

  A.8), Siegel suggests that ________.A.half brain sleep has something to do with icy weather

  B.the mystery of half brain sleep is close to being solved

  C.most birds living in cold regions tend to be half sleepers

  D.half brain sleep is a phenomenon that could exist among other species

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• 5Which of the following is evidence that TT is widely practiced、

  A.TT has been in existence for decades.

  B.Many patients were cured by therapeutic touch.

  C.TT therapists are often employed by leading hospitals.

  D.More than 100,000 people are undergoing TT treatment.

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