完形填空

　　You have waited 45 minutes for the valuable 10 minutes’ break between classes．But when the bell for the next class rings, you can’t believe how 　　1　　 time has passed．

　　If you are 　　2　　 with this scene, you’ll know how time flies when you are having fun and 　　3　　 when you are bored．Now scientists have 　　4　　 a reason why this is the case．

　　Scans have shown that patterns of activity in the brain 　　5　　 according to how we focus on a task．When we are 　　6　　, we concentrate more on how time is passing．And 　　7　　 makes our brains think the clock is ticking more slowly．

　　In an experiment 　　8　　 by a French laboratory, 12 volunteers watched an image 　　9　　 researchers monitored their brain activity．

　　The volunteers were told to 　　10　　 concentrate on how long an image appeared for, then 　　11　　 the color of the image, and thirdly, study both duration and color．The results showed that 　　12　　 was more active when the volunteers paid attention to 　　13　　 subjects．

　　It is thought 　　14　　 if the brain is focusing on many aspects of a task, it has to 　　15　　 its resources, and pays less attention to the clock．　　16　　, time passes without us really 　　17　　 it, and seems to go quickly．If the brain is not so active, it concentrates its 　　18　　 energies on monitoring the passing of time．　　19　　, time seems to drag．

　　Next time you feel bored 　　20　　, perhaps you should pay more attention to what the teacher is saying!

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阅读理解，阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

　　Time and how we experience it have always puzzled us．Physicists have created fascinating theories, but their time is measured by a pendulum(钟摆)and is not psychological time, which leaps with little regard to the clock or calendar．As some-one who understood the distinction observed, "When you sit with a nice girl for two hours it seems like a minute, but when you sit on a hot stove, a minute seems like two hours．"

　　Psychologists have long noticed that larger units of time, such as months and years, fly on swifter wings as we age．They also note that the more time is structured with schedules and appointments, the more rapidly it seems to pass．For example, a day at the office flies compared with a day at the beach．Since most of us spend fewer days at the beach and more at the office as we age, an increase in structured tune could well be to blame for why time seems to speed up as we grow older．

　　Expectation and familiarity also make time seem to flow more rapidly．Almost all of us have had the experience of driving somewhere we’ve never been before．Surrounded by unfamiliar scenery, with no real idea of when we'll arrive, we experience the trip as lasting a long time．But the return trip, although exactly as long, seems to take far less time．The novelty of the outward journey has become routine．Thus taking a different route on occasions can often help slow the clock．

　　When was become as identical as identical as beads(小珠子)on a string, they mix together, and even months become a single day．To counter this, try to find ways to interrupt the structure of your day-to stop time, so to speak．

　　Learning something new is one of the ways to slow the passage of time．One of the reasons the days of our youth seems so full and long is that these are the days of learning and discovery．For many of us, learning ends when we leave school, but this doesn't have to be．

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