Which of the following tells us how caffeine affects sleep、

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• 1The 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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• 2We 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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• 3Who had an important influence on early ballet、

  A.Balanchine

  B.Antoinette

  C.Louis XIV

  D.Diaghilev

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• 4Professional ballet was first performed in

  A.Italy

  B.Russia

  C.America

  D.France

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• 5The word "pageants" in paragraph 2 means

  A.dances

  B.big shows

  C.instruction

  D.royal courts

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• 6What does Paragraph 3 mainly discuss、

  A.Different effects of caffeinated coffee and decaf on sleep.

  B.Lotan Shilo's research design on sleep.

  C.What the subjects did after drinking decaf at night.

  D.Why some subjects took half an hour to fall asleep.

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• 7The 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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• 8Ohayon 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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• 9Why 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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• 10Why 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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