Directions：There are 20 blanks in the following passage．For each blank there are four choices marked[A]，[B]，[C]and[D]on the right side of the paper．You should choose the ONE that best fits into the passage．Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre．
　　Scientists have come up with a theory forwhy time flies when yon are having fun and drags when you are bored．
　　Scans have shown that 62 of activity in the brain change depending on how we focus on a task．Concentrating on time passing，as we do when bored，will 63 brain activity which will make it seem as though the clock is ticking more 64．The research， by the French Laboratory of Neurobiology and Cognition．is 65 in the magazine Science．来源：考试大的美女编辑们
　　In the study，12 volunteers watched an image while researchers 66 their brain activity using MRI(核磁共振成像)scans．Volunteers were given a variety of tasks．In one they were told to concentrate simply on the duration of an image．in 67 they were asked to focus on the color，and in a third they were asked to concentrate on both 68 and color．
　　The results showed that a network of brain regions was 69 when more subjects were paid attention to duration．
　　It is thought that if the brain is busy focusing on many 70 0f a task，then it has to spread its resources thinly，and pays less heed(注意)to time passing．Therefore，time passes without us really 71 it，and seems to go quickly．72，if the brain is not stimulated in this way．it concentrates its 73 energies on monitoring the passing of time．This may make time seem to 74．but in fact it is probably a more accurate perception of reality．75，the researchers found that the more volunteers concentrated on the duration of the images．the more 76 were their estimates of its duration．
　　Lead researcher Dr．Jennifer Coull said many of the areas of the brain 77 in estimating time were the same that played a key role in controlling movement．and preparing for action．She said this 78 suggests that the brain may make 79 of time as intervals between movements．in much the same way 80 musicians mark time with his foot．or athletes 81 the sound of a starter’s pistol．
　　62．[A] norms [B] modes [C]patterns [D]styles
　　63．[A]introduce [B]trigger [C]summon [D]create
　　64．[A]slowly [B]quickly [C]soon [D]fast
　　65．[A]collected [B]commenced [C]discovered [D]published
　　66．[A]conducted [B]monitored [C]graded [D]managed
　　67．[A]other [B]one [C] each [D]another
　　68．[A]endurance [B]shape [C]duration [D]formula
　　69．[A]activated [B]alleviated [C] mediated [D] deteriorated
　　70．[A]abstracts [B]angles [C]aspects [D]assumptions
　　71．[A]finding [B]noticing [C]discovering [D]experiencing
　　72．[A]Therefore [B]Thus [C]Moreover [D]However
　　73．[A]full [B]entire [C]total [D]complete
　　74[A]lag [B]stagger [C]drag [D]linger
　　75．[A]Likewise [B]Indeed [C]Hence [D]Otherwise
　　76．[A]accurate [B]true [C]certain [D] faithful
　　77．[A]included [B]contained [C] involved [D]covered
　　78．[A]overlap [B]collision [C]coincidence [D]extension
　　79．[A]meaning [B]implication [C]message [D]sense
　　80．[A]like [B]for [C]as [D]with
　　81．[A]manifest [B]provoke [C]articulate [D]anticipate
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