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t, but that turns out not to be the case. Instead, about 80 minutes after you fal l into sleep your activity cycle will increase slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to move around under your closed eyelids as if you were looking at somet hing occurring in front of you. This period of Rapid Eye Movements lasts for som e 8-15 minutes and is called REM sleep. During both light and deep sleep, the muscles in your body are relaxed but ca pable of movement. However, as you slip into REM sleep, a very odd thing occurs ? Most of the voluntary muscles in your body b***me paralyzed. Although your brai n shows very rapid bursts of neural activity during REM sleep, your body is inca pable of moving.The lower the stage of sleep,____.
A.the greater the alpha waves will be
B.the slower the brain waves will appear
C.activity pattern of the brain
D.the closer one is to the initial Stage 1 sleep
22、(同21题)Before one reaches the deepest sleep,____.
A.muscular inhibition occurs
B.one’s body muscles b***me paralyzed
C.loss of consciousness has already occurred
D.one’s eyes begin to move as if looking at something
23、(同21题)REM sleep is characterized by_____.
A.a drop in temperature
B.a loss of consciousness
C.a lack of body movement
D.the appearance of delta waves
24、(同21题)Muscular relaxation, a temperature drop, and breath regularity are characteristics of_____.
A.REM sleep
B.Stage 1 sleep
C.delta rhythms
D.Stage 2 and 3 sleep
25、(同21题)An increase in the activity cycle indicates____.
A.one is waking up
B.a relaxing of body muscles
C.an increase in the body’s rhythms
D. The disappearance of delta rhythm
26、第二篇 The Structure of the Brain When you refer to your brain, you should probably say ’brains’. Most modern s cientists studying the brain have concluded that there are three major parts of ou r brain, that each is separate from the others, and that each has its own functi on and different processes. Brain 1 includes the spinal cord, the medulla ? Which sites directly on the t op of the cord ? And the middle section of the brain. It includes the controls for involuntary functions like breathing and digestion. Brain 2 is an area surrounding brain 1. In this s***nd brain are the various glands located in the brain, such as the pituitary and amygdala. Scientists studyi ng brain 2 are convinced that human emotions such as excitement, fear, and love are centerd here, as well as the senses of taste and smell. Memory and learning are also controlled by brain 2. Brain 3 is the neocortex, the thick covering that surrounds the top and side portions of the brain. This is the ’gray matter’ we often think of when we speak of the brain. Only the higher orders of animals have brain 3, and none is as hig hly developed as the human neocortext. Brain 3 sends information from the other two brains to the body and receives data from the body. It is brain 3 that makes us fully human. Brian 3 allows us to stand erect, to see, to speak, to write, t o use symbols and tools, and to remember. Brain 3 also acts as a unifying contro l of the other two brains. As scientists continue to study the brain, they disco ver specific areas that control particular functions of the body and particular emotions.This passage is mainly about____
A.he functions of the three sections of the brain.
B.the human brain