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2017年6月英语六级阅读真题及答案 第2套 选词填空

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Half of your brain stays alert and prepared for danger when you sleep in a new place, a study has revealed. This phenomenon is often __26__ to as the "first-night-effect". Researchers from Brown University found that a network in the left hemisphere of the brain "remained more active" than the network in the right side of the brain. Playing sounds into the right ears (stimulating the left hemisphere) of __27__ was more likely to wake them up than if the noises were played into their left ear.
It was __28__ observed that the left side of the brain was more active during deep sleep. When the researchers repeated the laboratory experiment on the second and third nights they found the left hemisphere could not be stimulated in the same way during deep sleep. The researchers explained that the study demonstrated when we are in a __29__ environment the brain partly remains alert so that humans can defend themselves against any __30__ danger.
The researchers believe this is the first time that the "first-night-effect" of different brain states has been __31__ in humans. It isn't, however, the first time it has ever been seen. Some animal __32__ also display this phenomenon. For example, dolphins, as well as other __33__ animals, shut down one hemisphere of the brain when they go to sleep. A previous study noted that dolphins always __34__ control their breathing. Without keeping the brain active while sleeping, they would probably drown. But, as the human study suggest, another reason for dolphins keeping their eyes open during sleep is that they can look out for __35__ while asleep. It also keeps their physiological processes working.A. classified
B. consciously
C. dramatically
D. exotic
E. identified
F. inherent
G. marine
H. novel
I. potential
J. predators
K. referred
L. species
M. specifically
N. varieties
O. volunteers
重点单词   查看全部解释    
hemisphere ['hemisfiə]
想一想再看
n. 半球
联想记忆
alert [ə'lə:t]
想一想再看
adj. 警觉的,灵敏的
n. 警戒,警报
联想记忆
environment [in'vaiərənmənt]
想一想再看
n. 环境,外界
 
network ['netwə:k]
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n. 网络,网状物,网状系统
vt. (
 
species ['spi:ʃiz]
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n. (单复同)物种,种类
 
potential [pə'tenʃəl]
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adj. 可能的,潜在的
n. 潜力,潜能
 
identified
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adj. 被识别的;经鉴定的;被认同者 v. 鉴定(id
 
stimulated
想一想再看
adj. 受激的 v. 刺激(stimulate的过去式
 
phenomenon [fi'nɔminən]
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n. 现象,迹象,(稀有)事件
联想记忆
control [kən'trəul]
想一想再看
n. 克制,控制,管制,操作装置
vt. 控制
 

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