When you first drift off into slumber,
your eyes will roll about a bit, your temperature will drop slightly, your
muscles will relax, and your breathing will become quite regular. Your brain
waves slow down a bit, with the alpha rhythm predominating for the first few
minutes. This is the first stage of sleep. For the next 30 minutes or so, you
will drift down through Stage 2 and Stage 3. The lower your stage of sleep, the
slower your brain waves will be. About 40-60 minutes after you lose
consciousness, you will reach the last stage. Your brain waves will show the
delta rhythm. You may think that you stay at this deep stage all the rest of the
night, but that turns out not to be the case. About 80 minutes after you fall
into slumber, your activity cycle will increase slightly. The delta rhythm will
disappear, to be replaced by the activity pattern of brain A. move B. think C. work D. speak [单项选择] When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing will become quite regular. Your brain waves slow down a bit, with the alpha rhythm predominating for the first few minutes. This is the first stage of sleep. For the next 30 minutes or so, you will drift down through Stage 2 and Stage 3. The lower your stage of sleep, the slower your brain waves will be. About 40-60 minutes after you lose consciousness, you will reach the last stage. Your brain waves will show the delta rhythm. You may think that you stay at this deep stage all the rest of the night, but that turns out not to be the case. About 80 minutes after you fall into slumber, 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 dart around under your closed eyelids. This period of Rapid Eye Movements lasts for 8-15 minutes
A. is one stage B. are two stages C. are six stages D. are four stages [填空题]
What is the proper term when the ball goes off either end of the pitch [填空题]
Today when a pilot takes off from an airport, he can know{{U}}
(11) {{/U}}kind of weather to{{U}} (12) {{/U}}when he reaches
his destination (目的地). If there is{{U}} (13) {{/U}}rain or snow in the
mountains, a weather bureau (气象局)can predict the day and even the hour that a
river may overflow its banks many miles away. When a storm is moving in a
certain{{U}} (14) {{/U}}, the people in that area can learn{{U}}
(15) {{/U}}it in advance and prepare for it. Accurate weather
forecasts are helping millions of people everywhere to save their lives and
their property. 我来回答: 提交
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