Dreams can happen in any of the four stages of sleep. The most memorable and clearest dreams happen in the last stage of sleep (also known as REM sleep). The sleep cycle repeats about four to five times every night. So you can see how a person has several different dreams in one night. Most people only remember dreams that happen closer to the morning when they are about to wake up. That you can’t remember those dreams does not mean they never happened.
The stages in the sleep cycle are organized by the changes in different brain activities.

Stage 1: You are entering into light sleep. In this stage, your eyes move rapidly. We call this NREM. The body gets relaxed and your body temperature lowers. Your heart rate lowers, too. The body is preparing to enter into deep sleep.
Stage 2: Also characterized by NREM. In this stage, the body temperature and heart rate drop again. You are completely asleep.
Stage 3: Still in the NREM stage, this is a deeper sleep still.
Stage 4: In this stage of sleep, your eyes move back or forward. We call it REM sleep. This stage happens at about 90-100 minutes after the beginning of sleep. Your blood pressure rises, heart rate speeds up. The majority of your dreams happen in this stage.
These stages repeat themselves throughout a night’s sleep.
【小題1】 Dreams can happen in ___________.
A. Stage 1 and 2           B. Stage 3 and 4            C. every stage
【小題2】Which of the following sentences is TRUE according to the passage?
A. These stages will happen once or twice one night.
B. Most people only remember the dreams that happen when they are about to wake up.
C. If one can’t remember his dreams, he never dreams at all.
【小題3】What will happen in Stage 2?
A. Eyes move rapidly.   B. People enter into light sleep.    C. Heart rate drops.
【小題4】The first REM sleep happens about ___________ after the starting of sleep.
A. 1 to 2 hours                     B. 2 to 3 hours                     C. 10 minutes
【小題5】The passage is mainly about ___________.
A. the stages of sleep     B. types of dreams         C. remembering dreams


【小題1】C
【小題2】B
【小題3】C
【小題4】A
【小題5】A

解析【小題1】本文第一句提到夢(mèng)可能會(huì)發(fā)生在睡眠4個(gè)階段當(dāng)中的任何一個(gè)階段，故本題選C。
【小題2】本文第四行提到絕大多數(shù)人都能記住快要醒時(shí)所做的夢(mèng)，故B項(xiàng)是正確的，故本題選B。
【小題3】睡眠的第一階段人進(jìn)入淺睡眠狀態(tài)，眼睛跳動(dòng)的快，睡眠的第二階段人完全睡著了，體溫和心率下降，故本題選C。
【小題4】從圖表上可以看到人睡眠的第一階段大概發(fā)生在人睡覺后的1到2小時(shí)，故本題選A。
【小題5】本文主要談?wù)摿巳怂X時(shí)的四個(gè)階段，故本題選A。

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