be how the drug seems to lessen cognitive problems linked with low oxygen.

　　It isn't yet known whether diverting blood in this way could have negative effects in the long run.

　　"The results are striking and imply that oxiracetam may be beneficial for helping to relieve cognitive deficits caused by the altitude," says Timothy Hales at the University of Dundee, the UK.

　　"Oxiracetam is not licensed for medical use globally, but it is known to be a mild stimulant," says Hales. "Coca leaves have been used by native Andeans for centuries to overcome altitude sickness and this is attributed to their modest cocaine content. So perhaps it is not surprising that benefit can be derived from another, though mild, stimulant."

1.The underlined word "acclimatize" in Paragraph 3 is closest in meaning to 　　　.

A.adapt B.interact C.exist D.object

2.What does the experiment done in China reveal?

A.The higher altitude you are at, the slower your brain will be.

B.At 4,000 meters, the two subject groups show no difference.

C.Memory tests are beneficial to relieving attention difficulties.

D.The"smart drug" largely counters negative effects of altitude sickness.

3.According to the passage, the root cause of the cognitive effects lies in 　　　.

A.physical tiredness

B.low oxygen content

C.cognitive training

D.extreme high altitudes

4. What is the best title for the passage?

A.Fight high anxiety

B.Oxiracetam-a magic drug

C.Keep sharp at the altitude

D.Problems on high-altitude sites

第二节 任务型阅读

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