Brain pills, which help to【D6】________, would be welcomed by students who are studying for exams. Many professions would also us

Imagine the scene: you have an important exam tomorrow morning. Your future depends on it. You stay up all night, trying to memorize three or four years’ information in twelve hours. Sounds familiar? (26)But imagine you didn’t need to do this.  Imagine you could just take a brain pill and immediately remember everything.
(26) A memory pill, or any other pill that wakes up the brain, is a great idea, not only for students, but for lots of other professions. (27) Soldiers, who have to function with just a few hours’ sleep, would welcome it. So would pilots on lung trips, and shift workers who have to work with heavy machines at night.
But are we close to finding such a pill? A number of companies are already working on it. They see enormous financial possibilities in a pill that increases the memory, and laboratories have already been testing pills on both animals and humans.
(28) But a memory pill raises ethical questions too. Research tells us that the pill would be used not only by ill people, but also by people who just wanted to remember everyone’s name at parties, or the laziest students. Is this fair on poorer students who couldn’t afford the pill? Would businesses start asking their workers to take pills so that they performed better?
Medicine and its processes evolve. (29) Often, the original purpose gets lost. This has happened with plastic surgery. It may happen with cloning. The truth is, we don’t know how a memory pill would affect society. Fortunately, we probably have a few more years to think about it. (30) Most scientists believe that the drugs need much more testing. Some of these drugs work well with animals, but as one of the scientists says, "It isn’t clear that animals use the same kind of memories as humans. A mouse doesn’ t have to remember a shopping list during the day. "