關(guān)于咖啡和茶的英文閱讀理解

　　第一篇:《005-閱讀理解-第五篇 在深夜飲咖啡》

　　第五篇.Late-Night Drinking

　　Coffee lovers beware〔當(dāng)心〕. Having a quick "pick-me-up" cup of coffee late in the day will play havoc〔破壞〕with your sleep. As well as being a stimulant〔〕, caffeine interrupts〔打斷〕 the flow of melatonin〔褪黑激素〕,the brain hormone〔荷爾蒙〕that sends people into a sleep.

　　Melatonin levels normally start to rise about two hours before bedtime. Levels then peak（山峰）betweenn2 am and 4 am, before falling again. "It' s the

　　neurohormone(神經(jīng)激素) that controls our sleep and tells our body when to sleep and when to wake," says Maurice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California. But researchers in Israel have found that caffeinated coffee halves the body's levels of this sleep hormone.

　　Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volunteers（志愿者）slept less well after a cup of caffeinated coffee than after drinking the same amount of decaf（脫咖啡因咖啡）. On average, subjects slept 336 minutes per night after drinking caffeinated coffee, compared with 4l5 minutes after decaf. They also took half an hour to drop off- twice as long as usual -and jigged around in bed twice as much.

　　In the second phase(階段)of the experiment, the researchers woke the volunteers every three hours and asked them to give a urine(尿) sample. Shilo measured

　　concentrations（濃度）of a breakdown（分解）product of melatonin. The results suggest that melatonin concentrations in caffeine drinkers were half those in decaf drinkers. In a paper accepted for publication in Sleep Medicine, the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production.

　　Because it can take many hours to eliminate（排除）caffeine from the body, Ohayon recommends that coffee lovers switch to decaf after lunch.

　　練習(xí):

　　l. The author mentions "pick-me-up" to indicate（表明）that

　　A melatonin levels need to be raised.

　　B neurohormone can wake us up.

　　C coffee is a stimulant.

　　D decaf is a caffeinated coffee.

　　2. Which of the following tells us how caffeine affects sleep?

　　A Caffeine blocks production of the enzyme that stops melatonin production.

　　B Caffeine interrupts the flow of the hormone that prevents people from

　　sleeping.

　　C Caffeine halves the body's levels of sleep hormone.

　　D Caffeine stays in the body for many hours.

　　3. What does paragraph 3 mainly discuss?

　　A Different effects of caffeinated coffee and decaf on sleep.

　　B Different findings of Lotan Shilo and a team about caffeine.

　　C The fact that the subjects slept 4l5 minutes per night after drinking decaf.

　　D The proof that the subjects took half an hour to fall asleep.

　　4. What does the experiment mentioned in paragraph 4 prove?

　　A There are more experiment in decaf drinkers' urine sample.

　　B There are more melatonin concentrations in caffeine drinkers' urine sample.

　　C Decaf drinkers produce less melatonin.

　　D Caffeine drinkers produce less sleep hormone.

　　5. The author of this passage probably agrees that

　　A coffee lovers sleep less than those who do not drink coffee.

　　B we should not drink coffee after supper.

　　C people sleep more soundly at midnight than at 3 am.

　　D if we feel sleepy at night , we should go to bed immediately.

　　第五篇在深夜飲咖啡

　　咖啡愛好者注意了。在深夜喝一杯快速提神的咖啡會嚴(yán)重影響你的睡眠，跟一樣，咖啡因會擾亂褪黑激素的自由流動，這種褪黑激素是大腦里促人睡眠的一種荷爾蒙。

　　在上床睡覺前約2 小時的時候褪黑激素含量開始上升，在凌晨2 點到4 點達到最高值，然后再次下降。加州斯坦福大學(xué)斯坦福睡眠流行病學(xué)研究中心的Maurice Ohayon 說"控制我們睡眠的是神經(jīng)激素，它告訴我們的身體什么時候睡覺，什么時候醒來。"而以色列的研究人員發(fā)現(xiàn)含咖啡因的咖啡使這種睡眠荷爾蒙濃度降至一半。

　　Lotan Shilo 和Tel Aviv 大學(xué)"Sapir醫(yī)學(xué)中心"的'一組人員，在給六位志愿者做實驗時發(fā)現(xiàn)，他們在飲了咖啡因的咖啡后比飲了脫咖啡因的咖啡后睡眠質(zhì)量要差。平均來說，在喝了含咖啡因的咖啡后每晚睡眠時間為336 分鐘，而喝了脫咖啡因的咖啡后則睡415 分鐘。同時他們得花半個小時入睡，是通常情況的兩倍。另外，他們在床上輾轉(zhuǎn)次數(shù)也要長一倍。

　　在實驗的第二階段，研究人員每三個小時便叫醒一次志愿者，并叫他們提供尿樣。Shilo 檢驗了他們褪黑激素分解產(chǎn)物的濃度，結(jié)果顯示，咖啡因攝入者體內(nèi)的褪黑激素是非咖啡因攝入者的一半。在《睡眠醫(yī)學(xué)》刊物上發(fā)表的文章中，研究人員暗示說，褪黑激素的生成由酶來促成，而咖啡因阻止了酶的生成。

　　因為要花許多小時的時間才能將身體中的咖啡因除去， Ohayon 建議咖啡愛好者應(yīng)在午后換喝脫咖啡因的咖啡。

　　第五篇Late-Night Drinking

　　Coffee lovers beware〔當(dāng)心〕. Having a quick "pick-me-up" cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin,the brain hormone that sends people into a sleep.

　　Melatonin levels normally start to rise about two hours before bedtime. Levels then peak between 2 am and 4 am, before falling again. "It' s the neurohormone that controls our sleep and tells our body when to sleep and when to wake," says Maurice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California. But researchers in Israel have found that caffeinated coffee halves the

　　body's levels of this sleep hormone.

　　Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volunteers slept less well after a cup of caffeinated coffee than after drinking the same amount of decaf. On average, subjects slept 336 minutes per night after drinking caffeinated coffee, compared with 4l5 minutes after decaf. They also took half an hour to drop off- twice as long as usual -and jigged around in bed twice as much.

　　In the second phase of the experiment, the researchers woke the volunteers every three hours and asked them to give a urine sample. Shilo measured concentrationsof a breakdown product of melatonin. The results suggest that melatonin concentrations in caffeine drinkers were half those in decaf drinkers. In a paper accepted for

　　publication in Sleep Medicine, the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production.

　　Because it can take many hours to eliminate caffeine from the body, Ohayon recommends that coffee lovers switch to decaf after lunch.

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