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　　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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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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　　A recent strdy,published in last week's Journal of the American Medical Association,offers a picture of how dangerous it is to get a lift from a teenage driver．Indeed,a 16-year-old driver with three or more passengers is three times as likely to have a serious accident as a teenager driving alone．

　　The author also found that the death rates for teenage drivers increased dramatically after 10pm,and especially after midnight．With passengers in the car,the driver was even more likely to die in a latenight accident．

　　Robert Foss,a scientist at the University of North Carolina Highway Safety Research Center,says the higher death rates for teenage drivers have less to do with “really stupid behavior”than with just a lack of driving experience．“The basic problem,”he says,“is that adults who are responsible for giving out licenses fail to recognize how complex and skilled a task driving is．”

　　Both he and the author of the study believe that the way to mitigate（使缓解）the problem is to have states set up socalled graduated licensing systems,in which getting a license is a process with several stages．A graduated license requires that a teenager first prove himself able to drive in the presence of an adult,followed by a period of driving with night of passenger restrictions（限制）before graduating to full driving rights．

　　Graduated licensing systems have reduced teenage driver crashes,according to recent studies．

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