Climbing the most difficult mountains requires a very special mental condition. 21 the climber is doing something very difficult, everything that he or she sees, hears, or 22 must come together to help in the work of climbing.
答案：(D) feels
並列的感官動詞：看、聽、感覺，feels（感受到）符合這個並列結構；points（指）、says（說）、walks（走）都不是感官動詞，不符合並列邏輯。
本題大考中心未公布逐題答對率，以下不談數據，只談觀念。
四個選項都是動詞，文法上擺進去都成句，所以很容易只看「唸起來順不順」。這一格要看的是它跟前面兩個動詞是不是同一類。
先看空格所在的結構：everything that he or she sees, hears, or ___。用 or 串起來的三個動詞是並列的，而並列有一個常被忽略的要求——不只文法形態要對等，語意的類別也要同一類。前面兩個是 sees（看到）與 hears（聽到），都是感官動詞，講的是身體接收到的訊息；第三個當然也該是感官動詞，填 feels（感覺到）。看、聽、感覺，這是很自然的一組。再用整段驗算：這一篇講的是攀登時感官與身體的整合，「他所看到、聽到、感覺到的一切都必須整合起來」正合文意。
says（說）：說話是輸出不是接收，與看、聽不同類。points（指）：肢體動作，也不是感官接收。walks（走）：同樣是動作；而且它是不及物動詞，接不上 everything that ... 這個關係子句的結構——關係代名詞 that 代替的 everything 要當這個動詞的受詞，而 walk 沒有受詞。
see／hear／feel（看、聽、感覺，常並列的三個感官動詞）、feel like V-ing（想要做……）、come together（整合起來）、everything that …（……的一切）、help in（有助於）、climb a mountain（爬山）。
Climbing the most difficult mountains requires a very special mental condition. 21 the climber is doing something very difficult, everything that he or she sees, hears, or 22 must come together to help in the work of climbing.
All of the parts of the body work together smoothly and quietly 23 each part feels what is happening in the other parts. There is no room for thinking about what time it is, or about how one looks. 24 thinking must focus on what is happening at that moment, and the mind and the body become one. Only by entering this quiet mental state 25 a climber really do his or her best.