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Passage 2
Of all the components of a good night′ s sleep, dreams seem to be least within our control. Indreams, a window opens into a world where logic is suspended and dead people speak. A centuryago, Freud formulated his revolutionary theory that dreams were the disguised shadows of ourunconscious desires and fears; by the late 1970s, neurologists had switched to thinking of them asjust "mental noise"--the random byproducts of the neural-repair work that goes on during sleep.
Now researchers suspect that dreams are part of the mind′ s emotional thermostat, regulating moodswhile the brain is"off-line." And one leading authority says that these intensely powerful mentalevents can be not only harnessed but actually brought under conscious control, to help us sleep andfeel better, "It′s your dream," says Rosalind Cartwright, chair of psychology at Chicago′s MedicalCenter. "If you don′t like it, change it."
Evidence from brain imaging supports this view. The brain is as active during REM (rapid eyemovement) sleep--when most vivid dreams occur--as it is when fully awake, says Dr. EricNofzinger at the University of Pittsburgh. But not all parts of the brain are equally involved; thelimbic system (the "emotional brain") is especially active, while the prefrontal cortex (the center ofintellect and reasoning) is relatively quiet. "We wake up from dreams happy or depressed, and thosefeelings can stay with us all day." says Stanford sleep researcher Dr. William Dement.
The link between dreams and emotions shows up among the patients in Cartwright′s clinic.
Most people seem to have more bad dreams early in the night, progressing toward happier onesbefore awakening, suggesting that they are working through negative feelings generated during theday. Because our conscious mind is occupied with daily life we don′t always think about theemotional significance of the day′s events--until, it appears, we begin to dream.
And this process need not
细节题。根据第三段第二句可知，大多数人倾向于在刚入睡时做噩梦，在睡醒前的时候则会做一些开心的梦．而这表示人们在梦里就缓解了白天产生的不良情绪。由此可知，白天产生的负面情绪往往“出现在夜晚早期的梦中”．故选D。
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1931年，一位给人们带来光明的科学家重病的消息牵动着世界人民的心，几十名记者为他守夜。每隔一个小时就对外发布一次消息：“灯”还亮着。这位科学家是（ ）。
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