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.
【題組】25. (A) where (B) what (C) which (D) whether
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