(2) There's nothing better than a good night's rest. But have you ever wondered whyhuman beings need a good night’s sleep? It is hard to understand how important it is;however, when you add the number of hours you spend sleeping, sleep accounts for about athird of your life--so it must be important in some way.   Scientists have found that no animal, including human beings can live without sleep. In1894, Russian physician and scientist, Marie de Manacéine found that when puppies in acontinual activity without enough sleep, they died after only a couple of days. As for humans,not only scientists but also people who engaged in the research noticed that people havinginsufficient sleep would have similar effects: A decrease in mental functioning, a lack ofawareness and attention to the world around them, a distorted sense of time, and extremetiredness. The other much more notable research is the case of Randy Gardner. He stayedawake for 11 days and 24 minutes before his speech. For this reason, his speech was slurred,his thinking was fragmented and he wouldn’t even be able to perform simple math.   After all these studies, scientists think there are two main reasons making sleepimportant--it helps us repair and restore our organ systems and it plays a crucial role inmemory. While our body is resting, immune cells work better with more sleep. Forexample, T cells play an important role in the body immune system, people with enough sleepwill improve T cell functioning. As to memory, it helps us retain what we learned at work orschool for later use. That is to say, the ability to recall and use new information we learn atschool rely on the amount of sleep.    There is still a lot that we don't know about the potential benefits of sleep, but one thingis for sure: we can't live without it. And the closer we are to getting the optimal amount ofsleep (that's 8 to 10 hours for teens), the healthier we might be.
【題組】54. Why skipping sleep can be bad for human beings?
(A) That is because the amount of sleep is about a third of your life.
(B) That is because scientists provide strong evidence.
(C) That is because our body and mental would be greatly affected.
(D) That is because puppies with no amount of sleep will die.