A case of museum feet makes one feel like saying: "This is 21. I could have done the painting myself. When can we sit down? What time is it?"
答案：(A) boring
boring（無聊的／乏味的）符合「博物館腳」發作時，對展品產生審美疲勞、覺得乏味，甚至嘀咕「這我也會畫」的抱怨語氣；difficult／cool／exciting 均不符合此處語境。
四個選項都是形容詞，都能接在 This is 後面，你會憑印象挑一個。
鑑別度高達 58。空格落在引號裡的一段話，那是一個逛累了的孩子心裡的抱怨。後面緊接著三句：I could have done the painting myself（這畫我自己也畫得出來）、When can we sit down?（什麼時候可以坐下）、What time is it?（現在幾點）。三句都在表達不耐煩，所以引號裡的第一句必定是負面的評價——This is boring（好無聊）。填進去讀成 This is boring. I could have done the painting myself。同一段稍後的 a feeling of boredom and monotony（無聊與單調的感覺）用的正是 boring 的名詞形，再一次確認。
cool（很酷）與 exciting（令人興奮）都是正面的，與後面三句抱怨的口氣相反；difficult（困難的）雖然是負面的，但「這很難」與「我自己也畫得出來」互相矛盾——後面那句正是在說它一點也不難。
boring（令人厭煩的）與 bored（感到厭煩的）、boredom（無聊、厭煩）、monotony（單調）、museum feet（逛博物館逛到腳痠的疲憊感）、could have ＋ 過去分詞（當初其實可以……）、complain about（抱怨）。
Young visitors to museums often complain about having museum feet, the tired feeling one gets after spending too much time in a museum. A case of museum feet makes one feel like saying: "This is 21. I could have done the painting myself. When can we sit down? What time is it?" Studies of museum behavior show that the average visitor spends about four seconds looking at one object. For young visitors, the time span can be 22 shorter.
Children are more interested in smells, sounds, and the "feel" of a place than looking at a work of art. If they stay in a museum too long, a feeling of boredom and monotony will build up, leading 23 to impatience and fatigue.
To 24 museum feet, try not to have children look at too many things in one visit. It is reported that young visitors get more out of a visit if they focus on 25 nine objects. One and a half hours is the ideal time to keep their eyes and minds sharp, and their feet happy!