It is your chance to play around with the extraordinary abilities buried in unused parts of your brain. 29 , it is a way for you to put the deepest areas of your brain to good use while you’re sleeping.
答案：(A) In other words
前一句「這是你發揮潛藏能力的機會」，這一句用不同說法重述同一件事——「換句話說，這是讓你善用深層腦力的方式」，In other words（換句話說）符合這種換句話說、重新表述前述概念的邏輯；By no means（絕不）、At any cost（不惜代價）都語意不合，On the contrary（相反地）則因前後句並無真正對立關係而不通順。
這一格答對率 82%，不算難，但它是本批唯一的跨句題——線索不在自己這一句裡面，你一定要往前讀一句才判斷得出來。只盯著空格所在的句子，四個選項會覺得都能填。
把前後兩句擺在一起比對。前一句：It is your chance to play around with the extraordinary abilities buried in unused parts of your brain.（這是你去玩轉那些埋藏在大腦未使用區域裡的非凡能力的機會）。這一句：it is a way for you to put the deepest areas of your brain to good use（這是讓你把大腦最深處善加利用的方式）。unused parts of your brain 對到 the deepest areas of your brain，chance 對到 way——同一件事換個說法再講一次，這就是 In other words（換句話說）。給你一個判斷訣竅：當前後兩句的關鍵字幾乎可以一對一對應時，多半是換句話說，不是轉折。
On the contrary（相反地）最容易誤選，但它要求前後兩句真的對立；這兩句講的是同一件事，沒有任何對立。By no means（絕不、一點也不）是強烈否定，會把前一句整個推翻。At any cost（不惜任何代價）表達決心，跟前後文的邏輯無關。
in other words（換句話說）、that is to say（也就是說）、namely（也就是、亦即）、on the contrary（相反地）、by no means（絕不）、at any cost（不惜任何代價）、put sth to good use（善加利用……）、unused（未被使用的）。
You must have had this kind of experience: While in the middle of a normal dream, you suddenly realize that you are dreaming. This kind of dream is called a "lucid dream." The term "lucid" means clear; lucid dreamers know that they are dreaming and 26 they are dreaming of.
It is different from daydreaming. When a person is having a lucid dream, the person's body is 27 ; when a person daydreams, his/her body is awake. Thus, daydreams are really just waking thoughts. In lucid dreams, however, we are completely immersed in the dream world.
Yet, lucid dreaming is 28 just having a clear dream. It is your chance to play around with the extraordinary abilities buried in unused parts of your brain. 29 , it is a way for you to put the deepest areas of your brain to good use while you're sleeping. You can be an everyday Jane Doe or John Smith while awake but a superhero while sleeping, 30 who you are in real life. All the obstacles of reality can be set aside and you are able to accomplish tasks that you could never manage in waking reality.