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 (1) how quickly time has passed.

　　If you are familiar with this (2) , 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 this makes our brains (7) 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 (13) subjects.

　　It is thought that if the brain is (14)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!

　　1.A.guess B.learn C.believe D.doubt

　　2.A.view B.point C.scene D.experience

　　3.A.drags B.stops C.backs D.gains

　　4.A.thought over B.made up C.suggested D.come up with

　　5.A.change B.develop C.grow D.slow

　　6.A.sleepy B.bored C.excited D.active

　　7.A.report B.think C.decide D.see

　　8.A.produced B.carried C.tried D.performed

　　9.A.so B.when C.while D.but

　　10.A.partly B.quickly C.how D.first

　　11.A.remember B.focus on C.forget D.tell apart

　　12.A.the researchers B.the experiment C.the clock D.the brain

　　13.A.much attention to B.more attention to

　　C.attention to many D.attention to more

　　14.A.busy B.likely C.ready D.sure

　　15.A.focus B.gather C.reach D.spread

　　16.A.However B.Furthermore C.Therefore D.Finally

　　17.A.recognizing B.watching C.noticing D.counting

　　18.A.enough B.full C.right D.proper

　　19.A.In fact B.As a result C.For example D.Instead

　　20.A.in class B.with work C.in mind D.of lessons

　　答案解析

　　1【答案】C

　　【解析】课间十分钟玩得很开心，时间在不知不觉中就过去了。此处用can’t believe表示对这段时间飞快流逝的惊讶与感叹。

　　2【答案】C

　　【解析】上文提到的是一种特定的心理场面描写，而不是人所经历的某一件具体的事情，故选C。scene情节,场面 ;experience经验,经历,阅历。

　　3【答案】A

　　【解析】根据文中倒数第二段的解释可得知答案。drag拖长，此处指时间过的很慢。

　　4【答案】D

　　【解析】thought over仔细考虑 ;make up 组成; suggest建议;表明; come up with提出。

　　科学家是以实验为基础进行研究而提出的一种原因。

　　5【答案】A

　　【解析】联系下文的实验可知，当人的大脑集中于一个任务的多个面的时候，就变得比较活跃，反之，则变得不那么活跃。所以当大脑所注意的任务不同的时候，大脑的活动状态是不一样的。

　　6【答案】B

　　【解析】联系上下文可知，人在比较厌烦或感到无事可做的时候，才觉的时间过得很慢。

　　7【答案】B

　　【解析】时间过得很慢只是人的一种潜在的意识。

　　8【答案】D

　　【解析】空格所缺的词做定语，应与前面的experiment构成动宾关系，结合下文进行的实验可知，只有D项符合。B项应改为carried out 。

　　9【答案】C

　　【解析】此处用while强调在实验过程中，被实验者与研究人员的任务对比关系。

　　10【答案】D

　　【解析】根据后面的then; thirdly可得知答案。

　　11【答案】B

　　【解析】根据后文49个空后面的解释可知，实验的目的是让大脑不停的专注于一个任务的多个方面。

　　12【答案】D

　　【解析】此处指被研究人员的大脑思维比较活跃。

　　13【答案】D

　　【解析】结合上文的实验可知，研究人员是让实验者的大脑专注于一个任务的多个方面。

　　14【答案】A

　　【解析】be busy doing…忙于……为固定搭配;be likely to do…可能做……; be ready to do…准备做……; be sure of/about对……确信。

　　15【答案】D

　　【解析】联系上下文可知，当大脑专注于一个任务的多个方面时，它的精力就会被分散，因而就转移了对时间的注意。spread 此处为分散。

　　16【答案】C

　　【解析】此处是上述实验所得出的一个结论 。

　　17【答案】C

　　【解析】根据后文的 seems to go quickly可知，时间在不知不觉中过去。

　　18【答案】B

　　【解析】如果大脑不太活跃的时候，就会把相当多的精力集中在计算时间上，right/ proper正确的，恰当的，同义，可排除。enough足够的;full充足的;相当多的。

　　19【答案】B

　　【解析】 本句是根据前面的分析而得出的结论。

　　20【答案】A

　　【解析】本句与文章第一段相对应，是对第一段在课堂出现的问题的一种解决方法。另外，根据最后一句也可得出答案。