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.
答案：(A) for instance
舉例具體說明「以現實形式出現在夢中」是什麼意思（男孩夢到被大男孩欺負，跟現實一致），for instance（例如）符合舉例功能；in addition（此外，累加）、in a word（總之）、that is（也就是說）都不如 for instance 貼切這裡「舉一個具體案例」的語境。
本題大考中心未公布逐題答對率，以下不談數據，只談觀念。
前一句說「有時候令人害怕的事就以現實原本的樣子出現在夢裡」，後面接的是「男孩夢到自己被大男孩欺負」，讀起來很像把同一件事換句話說一次，所以 that is（也就是說）特別誘人。但這兩者的差別很關鍵：換句話說是把同一個說法講得更清楚，舉例是從說法走到一個具體個案。
四個選項都是轉承語，可見這一格考的是前後兩句的關係。前一句是一句通則：At other times the dreaded event from daily life simply occurs in a dream in its real-life form（在其他時候，日常生活中令人害怕的事就以它現實中的樣子出現在夢裡）。這一句給的是那個男孩——同一篇前面已經出場過的那個男孩——夢見自己被大男孩欺負。這是一個具體的案例，不是把通則重新定義，所以用 for instance（例如）。這一篇有一個很整齊的安排值得注意：第 27 題與本題是平行的兩組。第 27 題的 For example 引出的是「以象徵形式出現」的例子（夢見面對獅子），本題的 for instance 引出的是「以現實形式出現」的例子（夢見被欺負），同一個男孩、兩種夢的形式、兩個舉例的轉承語。看出這個平行結構，兩格一起就定案了。
that is（也就是說）：用來把剛剛的說法換一種講法或講得更精確，後面接的應該是同一件事的另一種表述，而不是一個新的具體情境。in addition（此外）：同向累加，用在再補一點新的內容，但本句不是在加新的一點，是在示範前一句。in a word（總之）：用來收尾、把前面講過的東西濃縮成一句話，而本句是在展開不是在收攏。
for instance（例如）、that is（也就是說）、in other words（換句話說）、in a word（總之）、in its real-life form（以現實生活中的樣子）、be bullied by（被……霸凌）。
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.