Diapers are 23 used by astronauts when they are outside the space shuttle, wearing a spacesuit.
答案：(D) still
still 意為「仍然」：當年為 Alan Shepard 想出的權宜辦法演變成尿布式太空廁所，直到今日太空人出艙穿太空衣時仍在使用；rather（相當）、almost（幾乎）、ever（曾經，多用於否定、疑問或完成式）語意都不合。
答對率 35%，鑑別度 9。
be + still + 過去分詞。still 你一定認得，難的是位置：本句是 Diapers are ___ used by astronauts（太空人使用尿布），空格夾在 be 動詞與過去分詞中間。你熟的是主詞 + still + 一般動詞（She still lives here. 她還住在這裡）。規則只有一句：still 放在 be 動詞後面、一般動詞前面，所以 are still used 正是標準位置。
本句自己沒有時間對照，線索要往前找四句。段落開頭說雪帕德的飛行原本只有十五分鐘，艙內沒有如廁的安排，後來延遲了好幾個小時，於是 It was then decided that Alan Shepard should relieve himself in his space suit（當時決定讓雪帕德直接在太空衣裡解決）。這個權宜辦法促成了第一座太空廁所——一種改良過的尿布。本句要說的就是：當年的臨時做法，到今天出艙時仍然在用。看到 be 動詞與過去分詞中間留空，先問一句「這裡是不是要接前面講過的事」，比逐個代選項快。一句記完：The old recipe is still used at that stall, three generations later.（三代過去了，那個攤子還在用同一份老配方。）〔情境取材自 107 學測作文題：排隊嘗鮮〕
rather（相當）修飾形容詞或副詞，不修飾動詞；almost（幾乎）語意不通；ever（曾經）多用於否定句、疑問句或完成式。still 的反義是 no longer（不再），本句若填得像 no longer 那個方向，前面整段鋪陳就白寫了。
be still used（仍在使用）、no longer（不再）、relieve oneself（如廁）、be supposed to（原本應該）。
The first American space toilet was Alan Shepard's space suit. His flight was supposed to last only 15 minutes, so there was no provision made for him to relieve himself in the capsule. His flight, 21, was delayed for hours. It was then decided that Alan Shepard should relieve himself in his space suit, and continue with the mission as scheduled.
22 problem urged NASA to develop the first space toilet, a modified diaper. Diapers are 23 used by astronauts when they are outside the space shuttle, wearing a spacesuit.
As the flights grew longer, a new set of two collection bags was devised, 24 for liquid wastes and the other for solid wastes. Once used, the bags are sealed and stored for the flight back to the earth, 25 they are disposed of.