You have waited 40 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．a(chǎn)ctive

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．a(chǎn)ttention to many  D．a(chǎn)ttention 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

1—5 CCADA        6—10 BBDCD      11—15 BDDAD     16—20 CCBBA

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