When all members in a group know what’s going on with each other, it is 14 that they will fight.
答案：(D) less likely
語意「當群體成員彼此了解狀況時，牠們打架的可能性就『比較低』」，less likely 符合，呼應前文說明糞便訊息有助於群體和諧；hardly surprising（不太令人驚訝）、more acceptable（更可接受）、truly important（真的重要）都不合。
看到 it is ___ that they will fight，很多人第一反應是把 it 當成「它」，回頭去找 it 指的是哪一個名詞。這裡的 it 是虛主詞，本身沒有意義，真正的主詞是後面的 that 子句 that they will fight——句子還原就是 That they will fight is less likely。
劍橋《English Grammar Today》在 Likely and unlikely 條目明確列出 likely 的兩種句型：S be likely to V（較常用），以及 It is likely that S will V（較少用），本題正是後者，而四個選項中只有 likely 走得通這個句型的語意。語意上，前一句 When all members in a group know what's going on with each other 說明群體彼此了解，配上本段主旨 peace and harmony in the group，打架的可能性應該是「降低」，所以選 less likely。
hardly surprising（不令人意外）、more acceptable（更能接受）、truly important（真的重要）三個放進 It is ... that 句型，文法上都成立，但語意接不上「和平與和諧」這個結論——這一題考的是讀懂段落的邏輯走向，不是文法對錯。
be likely to V（很可能……）、It is likely／unlikely that...（很可能／不太可能……）、more／less likely（可能性較高／較低）、be as likely as（可能性相當）。劍橋另有一項提醒：It is likely to 不等於 It is easy to，兩者不可混用。
From the campfire to the café, people have always gathered together to share the latest news. White rhinoceroses, 11 , do the same thing—only their choice of meeting place is a giant pile of poop. A new study indicates that rhinos have a smelly way to 12 .
Scientists studying white rhinos in South Africa have found that these animals leave messages in their poop. In particular, they leave their poop in the same place for all the other members in the group to smell—just like humans leaving messages on social media. Furthermore, different rhinos leave different chemicals in their poop, which provide important 13 about the age, sex, general health, and reproductive conditions of each specific rhino.
This is of great significance for the peace and harmony in the group. When all members in a group know what's going on with each other, it is 14 that they will fight.
The researchers have even made "fake poop" to see how different rhinos would react. They find that dominant males are particularly 15 the "fake poop" that carries chemicals from females ready to mate. The males sniff it for longer duration and come back to the same spot more frequently, a clear sign that they are gathering information about mating opportunities from the poop.