2. 外语
  3. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the "first-

That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the "first-

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问题     That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the "first-night" effect. If a person stays in the same room the following night they tend to sleep more soundly. Yuka Sasaki and her colleagues at Brown University set out to investigate the origins of this effect.
    Dr. Sasaki knew the first-night effect probably has something to do with how humans evolved. The puzzle was what benefit would be gained from it when performance might be affected the following day. She also knew from previous work conducted on birds and dolphins that these animals put half of their brains to sleep at a time so that they can rest while remaining alert enough to avoid predators (捕食者). This led her to wonder if people might be doing the same thing. To take a closer look, her team studied 35 healthy people as they slept in the unfamiliar environment of the university’s Department of Psychological Sciences. The participants each slept in the department for two nights and were carefully monitored with techniques that looked at the activity of their brains. Dr. Sasaki found, as expected, the participants slept less well on their first night than they did on their second, taking more than twice as long to fall asleep and sleeping less overall. During deep sleep, the participants’ brains behaved in a similar manner seen in birds and dolphins. On the first night only, the left hemispheres (半球) of their brains did not sleep nearly as deeply as their right hemispheres did.
    Curious if the left hemispheres were indeed remaining awake to process information detected in the surrounding environment, Dr. Sasaki re-ran the experiment while presenting the sleeping participants with a mix of regularly timed beeps (蜂鸣声) of the same tone and irregular beeps of a different tone during the night. She worked out that, if the left hemisphere was staying alert to keep guard in a strange environment, then it would react to the irregular beeps by stirring people from sleep and would ignore the regularly timed ones. This is precisely what she found.
What do we learn about Dr. Yuka Sasaki doing her research?
选项 A、She found birds and dolphins remain alert while asleep.
B、She found birds and dolphins sleep in much the same way.
C、She got some idea from previous studies on birds and dolphins.
D、She conducted studies on birds’ and dolphins’ sleeping patterns.
答案C
解析 本题可参照文章的第2段。从文章的第2段可知，她从之前有关鸟类和海豚的研究中获得了一些想法，由此进行实验以验证她的想法。据此可知，C项正确。A、B两项不正确，这都是以前的研究发现，并非佐佐木博士的研究发现。D项不正确，前人研究过鸟类和海豚的睡觉模式，而佐佐木博士研究的是人类的睡觉情况。C项与文章的意思相符，因此C项为正确答案。
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