The expression "beef up" in paragraph 3 means

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• 1Margaret Barnes thinks that a lack of movement in infancy can

  A.lead to learning troubles later.

  B.cause physical disabilities later.

  C.stimulate the five senses.

  D.bring about changes in the brain.

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• 2Research by Dr. Cameron seems to suggest that exercise can

  A.generate new blood vessels.

  B.change the way a person thinks.

  C.promote brain development.

  D.divert one's attention.

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• 3The baby's chances of developing cancer were said to be

  A.about 11 per cent

  B.around 19 per cent.

  C.less than 25 per cent.

  D.close to 5 per cent.

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• 4Susan Torres had been put on life support so

  A.she could live comfortably.

  B.she could see her baby.

  C.she could die without pain.

  D.she could deliver her baby.

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• 5Which is NOT true of the baby、

  A.She was born of a dead mother.

  B.She was two months premature

  C.She weighed about a kilogram.

  D.She was healthy.

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• 6To be beneficial, exercise for older people should

  A.be done in a group.

  B.be done on a daily basis.

  C.involve great difficulty.

  D.increase the heart rat

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• 7The title of the passage implies that

  A.only smart people do exercise.

  B.exercise can be smart or stupid.

  C.exercise keeps the brain strong.

  D.C.exercise keeps the brain strong.D.it is fashionable to do exercis

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