What does Paragraph 3 mainly discuss、

试卷相关题目

• 1Which of the following tells us how caffeine affects sleep、

  A.It blocks production of the enzyme that stops melatonin production.

  B.It interrupts the flow of the hormone that prevents people from sleeping.

  C.It halves the body's levels of sleep hormone.

  D.It stays in the body for many hours.

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• 2The author mentions "pick-me-up" to indicate that

  A.melatonin levels need to be raised

  B.coffee is a stimulant

  C.neurohormone can wake us up

  D.caffeine can balance our brain hormone

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• 3We can conclude from this passage that ballet

  A.is a dying art

  B.will continue to change

  C.is currently performed only in Russia

  D.is often performed by dancers with little training

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• 4Who had an important influence on early ballet、

  A.Balanchine

  B.Antoinette

  C.Louis XIV

  D.Diaghilev

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• 5Professional ballet was first performed in

  A.Italy

  B.Russia

  C.America

  D.France

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• 6The experiment mentioned in Paragraph 4 finds that caffeine drinkers

  A.produce less melatonin

  B.sleep longer than decaf drinkers

  C.produce more urine at night

  D.wake up every three hours

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• 7Ohayon advises coffee lovers

  A.to drink less coffee during the day

  B.to take decaf after lunch

  C.not to go to bed after taking coffee

  D.not to drink coffee after supper

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• 8Why didn't the French scientist continue to make the medicine that stopped pain、

  A.It didn't work well.

  B.It was hard to make.

  C.It hurt the stomach.

  D.It was not cost-effectiv

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• 9Why was Felix Hoffmann looking for a painkiller、

  A.His company told him to do that.

  B.His father was in pain.

  C.He wanted to make a lot of money．

  D.He suffered from headach

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• 10Bayer started making aspirin because

  A.it helped prevent heart attacks．

  B.other companies were making it.

  C.it worked well in stopping pain．

  D.the manager was a scientist.

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