Question

American researchers have discovered that human brains and sleep patterns are confused by devices(装置) that give out bright lights. Electronics, such as laptops, mislead our minds into thinking that it is still daytime, preventing sleep and increasing the risk of insomnia.

Sleep experts say human's natural body clock begins to rest and relax from the day between 9 and 10 pm but the use of computers confuses it.

A person's brain biologically becomes awake when the sun is out because bright light after dark causes the brain to stop producing the hormone (荷尔蒙) called melatonin that makes us sleepy.

Researchers say blue light from devices such as iPads, which is expected to become a popular reading tool when it comes out later this month, is particularly disruptive (干扰的)during the night when the brain thinks it should be dark.

Experts say a good book is a far better way of resting the brain and ensuring a good night's sleep because the bedside lamp(灯) light doesn't affect the brain as it does not look straight into a person's eyes.

“Potentially, yes, if you're using an iPad or a laptop close to bedtime... that light can be stimulating (刺激) to the brain to make it more awake and delay your ability to sleep，” Phyllis Zee, a professor at Northwestern University and director of the school's Centre for Sleep & Circadian Biology, told CNN.

“And I think more importantly, it could also be enough to affect your circadian (昼夜节律的) rhythm. This is the clock in your brain that determines when you sleep and when you wake up. ”

Alon Avidan, associate director of the Sleep Disorders Center at the University of California Los Angeles, added, “I wish people would just take a boring book — an old­fashioned book — and read by a lamp.”

1.The underlined word “insomnia” in the first paragraph probably means “________”．

A．being unable to eat properly

B．brain injury

C．being unable to fall sleep

D．lack of energy

2.Melatonin is the hormone that ________.

A．makes us sleepy

B．helps us relaxed

C．prevents us from waking up

D．makes us excited

3.The bedside lamp light doesn't affect the brain because ________.

A．it doesn't give out blue light

B．it's not as bright as your laptop

C．it doesn't enter your eyes directly

D．it is adjustable

4.We can conclude from the passage that ________.

A．one who uses his laptop often before bedtime can have his body clock disturbed

B．using a laptop before bedtime is more harmful than using an iPad

C．we'd better not do anything before going to bed

D．the best time to go to bed is before 9 pm

Answer

1.C

2.A

3.C

4.A

【解析】试题分析：美国研究者发现在睡觉前用电脑或Ipad可导致失眠。

1.词义猜测题。根据第一段第二句：Electronics, such as laptops, mislead our minds into thinking that it is still daytime, preventing sleep and increasing the risk of insomnia. 电子产品，如笔记本电脑会误导我们的头脑以为时间仍然是白天，阻止了睡眠和增加了。。。的风险。A吃的不合适B大脑受损C不能入睡D缺乏精力，根据语境所有C正确。

2.细节理解题。根据第三段A person's brain biologically becomes awake when the sun is out because bright light after dark causes the brain to stop producing the hormone (荷尔蒙) called melatonin that makes us sleepy. 当太阳出来时一个人的生物上的大脑变得清醒，因为在黑暗之后的明亮的灯光导致大脑停止生产使我们昏昏欲睡激素（荷尔蒙）叫褪黑激素，A是我们困倦B是我们放松C阻止我们醒来 D是我们兴奋，所以A正确

3.细节理解题。根据文章第五段中the bedside lamp(灯) light doesn't affect the brain as it does not look straight into a person's eyes.旁边的灯不影响大脑因为它看起来不直接地进入人的眼睛， A不发出蓝光B不像手提电脑那么亮C不直接进入人的眼睛D它是可以调整的，故选C。

4.“And I think more importantly, it could also be enough to affect your circadian (昼夜节律的) rhythm. This is the clock in your brain that determines when you sleep and when you wake up. ” 我认为，更重要的是，它也可能是足以影响你的生物钟（昼夜节律的）节奏。这是你的大脑时钟，它决定你何时入睡何时醒来，，故选A。

考点：科普类短文阅读