In ________ times human beings did not travel for pleasure but to find a more favourable climate.

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• 1Put on dark glasses or the sun will ________ you and you won’t be able to see.

  A.discern

  B.distort

  C.distract

  D.dazzle

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• 2To ________ is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment.

  A.conserve

  B.conceive

  C.convert

  D.contrive

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• 3The helicopter a light plane and both pilots were killed.

  A.coincided with

  B.stumbled on

  C.tumbled to

  D.collided with

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• 4As soon as the boy was able to earn his own living he ________ his parents’ strict rules.

  A.defied

  B.refuted

  C.excluded

  D.vetoed

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• 5He ________ his head, wondering how to solve the problem.

  A.scrapped

  B.screwed

  C.scraped

  D.scratched

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• 6A new study on birds’ sleep has revealed that ____________.

  A.birds can control their half-brain sleep consciously

  B.birds seldom sleep with the whole of their brain at rest

  C.half-brain sleep is found in a wide variety of birds

  D.half-brain sleep is characterized by slow brain waves

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• 7According to the passage, birds often half sleep because ______________.

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

  B.the two halves of their brain are differently structured

  C.they have to watch out for possible attacks

  D.their brain hemisphere take turns to rest

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• 8The example of a bird sleeping in front of a mirror indicates that _____________.

  A.birds prefer to sleep in pairs for the sake of security

  B.the phenomenon of birds dozing in pairs is widespread

  C.a single pet bird enjoys seeing its own reflection in the mirror

  D.even an imagined companion gives the bird a sense of security

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• 9While sleeping, some water mammals tend to keep half awake in order to __________.

  A.avoid being swept away by rapid currents

  B.emerge from water now and then to breathe

  C.alert themselves to the approaching enemy

  D.be sensitive to the ever-changing environment

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• 10By “just the tip of the iceberg” (Line 2, Par

  A.8), Siegel suggests that ____________.A.half-brain sleep is a phenomenon that could exist among other species

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

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

  D.half-brain sleep has something to do with icy weather

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