In 21 , the brain waves of a sleeping person are similar to those of a waking person, and the eyes move about rapidly under the closed lids. 22 kind of sleep is Non-Rapid Eye Movement sleep.
答案：(C) The other
語意「另一種睡眠是非快速動眼期睡眠」，前面已經講了兩種睡眠中的第一種（REM），這裡用 The other 特指「兩者中的另一個」；Other（其他的，不特指）、Another（另一個，用於三個以上任一個，這裡只有兩種不適用）、Others（複數，不合單數kind）都不合。
本題大考中心未公布逐題答對率，以下不談數據，只談觀念。
other、another、the other、others 這一組是英文裡最容易混的組合之一，四個都翻成「其他的、另一個」，光靠中文根本分不開。分它們不必靠語感，靠的是「一共有幾個」和「剩下幾個」。
四個選項都是 other 家族的成員，可見這一格考的是「總數與剩餘數」，那就回頭數。這一篇的第一句就把總數講死了：there are two kinds of sleep（睡眠有兩種）；第二句 One is Rapid Eye Movement (REM) sleep 點名了第一種。兩個之中已經講掉一個，剩下的那一個是唯一且確定的，所以要用 the other。掛鉤是國中背過的 I have two pens. One is red; the other is blue.（我有兩枝筆，一枝是紅的，另一枝是藍的。）。順便把整組分清楚：兩者用 one... the other...；三者以上任取一個用 one... another...；剩下的全部（複數）用 the others。92 年第 24 題考的正是同一組的另一半——那一格空在 one 的位置，靠後面出現的 the other 反推；本題空在 the other 的位置，靠前面的 two 與 One 反推。兩題擺在一起看，這一組就不會再混。
Another（另一個）：用在三個以上的情況，表示「再來一個、不特定的另一個」，而本篇一開始就說只有兩種，另一種是確定的，不能用不特定的說法。Other（其他的）：後面要接複數名詞或不可數名詞（other people、other kinds），不能直接修飾單數的 kind。Others（其他人、其他的東西）：本身是複數代名詞，不能拿來修飾後面的 kind。
one … the other …（兩者中的一個……另一個……）、one … another …（三者以上的一個……另一個……）、the others（其餘的全部）、each other（彼此）、on the other hand（另一方面）、in other words（換句話說）。
Basically, there are two kinds of sleep. One is Rapid Eye Movement (REM) sleep. In 21 , the brain waves of a sleeping person are similar to those of a waking person, and the eyes move about rapidly under the closed lids. 22 kind of sleep is Non-Rapid Eye Movement sleep.
Scientists have discovered that dreams happen mainly in REM sleep. Everyone dreams about 20 percent of their sleeping time. 23 people who say they never dream show about 20 percent of REM sleep. 24 these "non-dreamers" do their sleeping in a laboratory 25 researchers can wake them up and ask them whether they were having dreams the moment before, it 26 that they dream as much as others.
Events in daily life sometimes occur symbolically in dreams. 27 , a boy is having difficulties on the school playground because a bigger boy keeps bullying him. He may dream at night of being alone in the playground, 28 a lion. At other times the dreaded event from daily life simply occurs in a dream in its real-life form; 29 , the boy dreams of being bullied by the bigger boy.
30 scientific research, we have known more about the relationship between sleep and dreams. However, why a dream will take a certain symbolic form is still a mystery.