閱讀下列短文，從短文后各題所給的四個選項(xiàng)（A、B、C和D）中，選出可以填入空白處的最佳選項(xiàng)，并在答題卡上將該項(xiàng)涂黑。

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 _______time has passed．

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

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

In an experiment_______ by a French laboratory, 12 volunteers watched an image _______ researchers monitored their brain activity．

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

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

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

1.A．slowly B．foolishly C．terribly D．quickly

2.A．disappointed B．satisfied C．familiar D．similar

3.A．drags B．stops C．goes D．backs

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

5.A．change B．develop C．grow D．slow

6.A．sleepy B．bored C．excited D．a(chǎn)ctive

7.A．which B．we C．what D．this

8.A．produced B．carried out C．tried D．did

9.A．where B．why C．while D．a(chǎn)s

10.A．first B．quickly C．how D．partly

11.A．familiar with B．focus on C．make out D．tell apart

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

13.A．no B．less C．more D．some

14.A．when B．which C．that D．where

15.A．spread B．gather C．reach D．fix

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

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

18.A．full B．enough 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

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