To 24 museum feet, try not to have children look at too many things in one visit.
答案：(D) avoid
avoid museum feet（避免博物館腳）表示為了避免這種疲憊感，最好不要讓孩子一次看太多展品；affect／approach／assure 均不符合此處語意。
四個選項都是 a 開頭的動詞，長得很像，容易混淆，你會掃過去挑一個最眼熟的。
鑑別度高達 67，是本批最會分人的一題。句首的 To ______ museum feet 是表目的的不定詞，後面的主要子句是 try not to have children look at too many things in one visit（別讓孩子在一次參觀裡看太多東西）。主要子句是一個預防的建議，所以目的必定是「避免」逛到腳痠這件事發生——填 avoid。填進去讀成 To avoid museum feet, try not to have children look at too many things（為了避免逛到腳痠，別讓孩子一次看太多）。
affect（影響）後面接的是被影響的那樣東西，但沒有人的目的是「去影響腳痠」；approach（接近、著手處理）方向相反，是往它靠過去；assure（向……保證）後面要先接一個人，assure somebody of something 是「向某人保證某事」，這一句沒有要向誰保證，而且它與 ensure（確保）也很容易混。四個都是 a 開頭的動詞原形，形態吻合，容易被順手選走。
avoid ＋ V-ing 或名詞（避免）、prevent A from V-ing（防止 A 做某事）、assure somebody of something（向某人保證某事）、ensure（確保）、affect（影響）、approach（接近；著手處理）。
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!