The objective is to promote peace all over the world, and to 26 barriers between every nationality.
答案：(D) break down
【句型】break down barriers 指「打破/消除障礙」；skip over（跳過）、come across（偶然遇到）、look into（調查）都不合。
break down 在你腦中的第一個意思大概是「（機器）故障、拋錨」或「（人）崩潰」，都是不及物的用法，所以看到後面接 barriers 反而不敢選。相對地，look into（調查）看起來像一件正經事，就被選走了。
先看句子的結構：The objective is to promote peace all over the world, and to ______ barriers between every nationality. and 把兩個不定詞並列，前面那個是 promote peace（促進和平）。並列的兩件事必須同方向，所以空格這件事也得對和平有幫助。barrier 是「隔閡、障礙」，要促進和平，對隔閡該做的是把它拆掉、消除。break down 除了故障之外，還有一個常考的及物用法：把某個東西拆解、消除，最常見的搭配就是 break down barriers（劍橋詞典）。同一個片語動詞及物與不及物意思差很多，這是片語動詞題反覆出現的陷阱。
skip over：跳過、略過，語意上是不處理，與促進和平的方向對不上。come across：偶然遇到、給人某種印象，後面接的是遇到的對象，不能拿來處理障礙。look into：調查、研究，調查隔閡不等於消除隔閡，達不到 promote peace 的目的。
break down barriers（消除隔閡）、break down（故障、拋錨）、break out（爆發）、come across（偶然遇到）、look into（調查）、in an effort to（為了…而）。其中 look into 這一組考過 4 個年度，99 年第 18 題 →、99 課綱學測參考用試卷第 29 題 →、106 年第 16 題 →都出現過；come across 考過 3 個年度，99 課綱學測參考用試卷第 29 題 →、109 年第 23 題 →都出現過。
In the fall of 1973, in an effort to bring attention to the conflict between Egypt and Israel, World Hello Day was born. The objective is to promote peace all over the world, and to 26 barriers between every nationality. Since then, World Hello Day—November 21st of every year— 27 observed by people in 180 countries. Taking part couldn't be 28 . All one has to do is say hello to 10 people on the day.
However, in response to the 29 of this event, the concepts of fostering peace and harmony do not have to be confined to one day a year. We can 30 the spirit going by communicating often and consciously. It is a simple act that anyone can do and it reminds us that communication is more effective than conflict.