Dreams Studies show that in dreams things are seen and heard rather that thought. In terms of the senses, visual experience

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问题                             Dreams
    Studies show that in dreams things are seen and heard rather that thought. In terms of the senses, visual experience is present in almost all dreams; auditory experience in 40 to 50 percent; and touch, taste, smell, and pain in a relatively small percentage. A considerable amount of emotion is commonly present, usually a pure and single emotion such as fear, anger, or joy.
    The clearly distinguishable states of sheep exist. The first state, called NREM-sheep (non-rap-id-eye movement sleep), occupies most of the sleep period and is associated with a relatively low pulse and blood pressure, and few or no reports of dreaming. The second type of sheep, known as REM-sleep (rapid-eye-movement sleep) occurs cyclically during the sleep period with rapid eye movements and frequent dream reports. Typically, a person has four or five periods of REM-sleep during the night, whether the dreams are remembered often, rarely, or not at all; they occur at intervals of about 90 minutes and altogether make up about 25 percent of the night’s sleep (as much as 50 percent in a newborn child). Evidence indicates that a dream period usually lasts from 5 to 20 minutes. Sounds and touches working on a dreamer can go into a dream if they occur during a Remperiod. Although mental activity may be reported during NREM-sleep, these are usually short pieces of thought like experiences.
    Modern dream research has focused on two general interpretations of dream content. In one view, dreams have no meaning of their own but are simply a process by which the brain integrates new information into memories. In the other view, dreams contain real meaning symbolized in a picture language distinct from conscious logical thought. If dreams express important wishes, fears, concerns, and worries of the dreamer, the study and analysis of dreams can help reveal previously unknown aspects of a person’s mental functioning.  
This essay tells us that______.

选项 A、people usually dream in a NREM sleep
B、people usually dream in an REM sleep
C、people always remember what they have dreamed in an REM sleep
D、people may have an REM sheep all night through

答案B

解析 根据文章第二段的第三句我们知道在REM睡眠中,人们经常会做梦。因此选项B是正确的。
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