2. 专升本
  3. 【T1】After a busy day of work and play, the body needs to rest. Sleep is necessary for good health.【T2】During this time, the body

【T1】After a busy day of work and play, the body needs to rest. Sleep is necessary for good health.【T2】During this time, the body

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问题    【T1】After a busy day of work and play, the body needs to rest. Sleep is necessary for good health.【T2】During this time, the body recovers from the activities of the previous day.【T3】The rest that you get while sleeping enables your body to prepare itself for the next day.
   【T4】There are four levels of sleep, each being a little deeper than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down.【T5】After you reach the fourth level, your body shifts back and forth from one level of sleep to the other.
   【T6】Although your mind slows down, from time to time you will dream. Scientists who study sleep state that when dreaming occurs, your eyeballs begin to move more quickly(although your eyelids are closed). This stage of sleep is called REM, which stands for rapid eye movement.
【T5】
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答案在到达第四个阶段之后，你的身体将在四个阶段之间循环。
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