Question

American researchers have discovered that human brains and sleep patterns are confused by devices(裝置) 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 (荷爾蒙) 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 (干擾的)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(燈) 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 (晝夜節(jié)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

1.C

2.A

3.C

4.A

【解析】試題分析：美國研究者發(fā)現(xiàn)在睡覺前用電腦或Ipad可導(dǎo)致失眠。

1.詞義猜測題。根據(jù)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. 電子產(chǎn)品，如筆記本電腦會誤導(dǎo)我們的頭腦以為時間仍然是白天，阻止了睡眠和增加了。。。的風(fēng)險。A吃的不合適B大腦受損C不能入睡D缺乏精力，根據(jù)語境所有C正確。

2.細(xì)節(jié)理解題。根據(jù)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 (荷爾蒙) called melatonin that makes us sleepy. 當(dāng)太陽出來時一個人的生物上的大腦變得清醒，因為在黑暗之后的明亮的燈光導(dǎo)致大腦停止生產(chǎn)使我們昏昏欲睡激素（荷爾蒙）叫褪黑激素，A是我們困倦B是我們放松C阻止我們醒來 D是我們興奮，所以A正確

3.細(xì)節(jié)理解題。根據(jù)文章第五段中the bedside lamp(燈) light doesn't affect the brain as it does not look straight into a person's eyes.旁邊的燈不影響大腦因為它看起來不直接地進(jìn)入人的眼睛， A不發(fā)出藍(lán)光B不像手提電腦那么亮C不直接進(jìn)入人的眼睛D它是可以調(diào)整的，故選C。

4.“And I think more importantly, it could also be enough to affect your circadian (晝夜節(jié)律的) rhythm. This is the clock in your brain that determines when you sleep and when you wake up. ” 我認(rèn)為，更重要的是，它也可能是足以影響你的生物鐘（晝夜節(jié)律的）節(jié)奏。這是你的大腦時鐘，它決定你何時入睡何時醒來，，故選A。

考點(diǎn)：科普類短文閱讀