Late-Night Drinking　　Coffee lovers beware. Having a quick pick-me-up cup of coffee1 late in the day will play havoc with2 your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that sends people into a sleep.　　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 concentrations of 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 suggest6 that caffeine blocks production of the enzyme that drives melatonin production.　　1. The author mentions pick-me-up to indicate that　　B neurohormone can wake us up.　　D decaf is a caffeinated coffee.　　A Caffeine blocks production of the enzyme that stops melatonin production.　　C Caffeine halves the bodys levels of sleep hormone.　　3. What does paragraph 3 mainly discuss?　　B Different findings of Lotan Shilo and a team about caffeine.　　D The proof that the subjects took half an hour to fall asleep.　　A There are more enzymes in decaf drinkers urine sample.　　C Decaf drinkers produce less melatonin.　　5. The author of this passage probably agrees that　　B we should not drink coffee after supper.　　D if we feel sleepy at night, we should go to bed immediately.　　1. C pick-me-up指提神飲料，也就是一種剌激物，在這篇文章里具體指咖啡。所以，答案應(yīng)選 C?！　?. A第三段涉及的是一個(gè)實(shí)驗(yàn)，這個(gè)實(shí)驗(yàn)的目的是測(cè)試含咖啡因咖啡和脫咖啡因咖啡對(duì)睡眠的影響，該段主要談?wù)摰氖沁@個(gè)實(shí)驗(yàn)的結(jié)果?！　?. B 文章的結(jié)尾談到， Ohayon建議愛喝咖啡的人午飯后應(yīng)該換喝脫咖啡因咖啡。另外，整個(gè)文章都在探討咖啡因影響睡眠的機(jī)理，所以，作者大概會(huì)同意晚飯后不應(yīng)該喝咖啡的說法。選項(xiàng) A是一個(gè)全稱判斷，這等于說所有喜歡喝咖啡的人都比不喝咖啡的人睡覺少。這不一定，因?yàn)槿绻Х冗m量，喝咖啡的時(shí)間適當(dāng)，咖啡不會(huì)影響睡眠。所以，作者可能不會(huì)同意這種說法。根據(jù)文章第二段第二個(gè)句子，選項(xiàng) C是錯(cuò)的。根據(jù)文章第二段的第一個(gè)句子，我們體內(nèi)褪黑激素 的濃度在我們上床時(shí)間前兩個(gè)小時(shí)開始上升，而這個(gè)時(shí)候我們會(huì)開始有困意。反過來說就是，人們并非一有困意就睡覺。所以，選項(xiàng) D不是答案?！　】Х葠酆谜咦⒁饬?。在深夜喝一杯快速提神的咖啡會(huì)嚴(yán)重影響你的睡眠，跟興奮劑一樣，咖啡因會(huì)擾亂褪黑激素的自由流動(dòng)，這種褪黑激素是大腦里促人睡眠的一種荷爾蒙。　　LotanShilo和Tel Aviv大學(xué)Sapir醫(yī)學(xué)中心的一組人員，在給六位志愿者做試驗(yàn)時(shí)發(fā)現(xiàn)，他們?cè)陲嬃丝Х纫虻目Х群蟊蕊嬃嗣摽Х纫虻目Х群笏圪|(zhì)量要差。平均來說，在喝了含咖啡因的咖啡后每晚睡眠時(shí)間336分鐘，而喝了脫咖啡因的咖啡后則睡415分鐘。同時(shí)他們得花半個(gè)小時(shí)入睡，是通常情況的兩倍，另外，他們?cè)诖采陷氜D(zhuǎn)次數(shù)也要長一倍?！　∫?yàn)橐ㄔS多小時(shí)的時(shí)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。

　　Late-Night Drinking　　Coffee lovers beware. Having a quick pick-me-up cup of coffee1 late in the day will play havoc with2 your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that sends people into a sleep.　　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 concentrations of 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 suggest6 that caffeine blocks production of the enzyme that drives melatonin production.　　1. The author mentions pick-me-up to indicate that　　B neurohormone can wake us up.　　D decaf is a caffeinated coffee.　　A Caffeine blocks production of the enzyme that stops melatonin production.　　C Caffeine halves the bodys levels of sleep hormone.　　3. What does paragraph 3 mainly discuss?　　B Different findings of Lotan Shilo and a team about caffeine.　　D The proof that the subjects took half an hour to fall asleep.　　A There are more enzymes in decaf drinkers urine sample.　　C Decaf drinkers produce less melatonin.　　5. The author of this passage probably agrees that　　B we should not drink coffee after supper.　　D if we feel sleepy at night, we should go to bed immediately.　　1. C pick-me-up指提神飲料，也就是一種剌激物，在這篇文章里具體指咖啡。所以，答案應(yīng)選 C。　　3. A第三段涉及的是一個(gè)實(shí)驗(yàn)，這個(gè)實(shí)驗(yàn)的目的是測(cè)試含咖啡因咖啡和脫咖啡因咖啡對(duì)睡眠的影響，該段主要談?wù)摰氖沁@個(gè)實(shí)驗(yàn)的結(jié)果。　　5. B 文章的結(jié)尾談到， Ohayon建議愛喝咖啡的人午飯后應(yīng)該換喝脫咖啡因咖啡。另外，整個(gè)文章都在探討咖啡因影響睡眠的機(jī)理，所以，作者大概會(huì)同意晚飯后不應(yīng)該喝咖啡的說法。選項(xiàng) A是一個(gè)全稱判斷，這等于說所有喜歡喝咖啡的人都比不喝咖啡的人睡覺少。這不一定，因?yàn)槿绻Х冗m量，喝咖啡的時(shí)間適當(dāng)，咖啡不會(huì)影響睡眠。所以，作者可能不會(huì)同意這種說法。根據(jù)文章第二段第二個(gè)句子，選項(xiàng) C是錯(cuò)的。根據(jù)文章第二段的第一個(gè)句子，我們體內(nèi)褪黑激素 的濃度在我們上床時(shí)間前兩個(gè)小時(shí)開始上升，而這個(gè)時(shí)候我們會(huì)開始有困意。反過來說就是，人們并非一有困意就睡覺。所以，選項(xiàng) D不是答案?！　】Х葠酆谜咦⒁饬?。在深夜喝一杯快速提神的咖啡會(huì)嚴(yán)重影響你的睡眠，跟興奮劑一樣，咖啡因會(huì)擾亂褪黑激素的自由流動(dòng)，這種褪黑激素是大腦里促人睡眠的一種荷爾蒙。　　LotanShilo和Tel Aviv大學(xué)Sapir醫(yī)學(xué)中心的一組人員，在給六位志愿者做試驗(yàn)時(shí)發(fā)現(xiàn)，他們?cè)陲嬃丝Х纫虻目Х群蟊蕊嬃嗣摽Х纫虻目Х群笏圪|(zhì)量要差。平均來說，在喝了含咖啡因的咖啡后每晚睡眠時(shí)間336分鐘，而喝了脫咖啡因的咖啡后則睡415分鐘。同時(shí)他們得花半個(gè)小時(shí)入睡，是通常情況的兩倍，另外，他們?cè)诖采陷氜D(zhuǎn)次數(shù)也要長一倍?！　∫?yàn)橐ㄔS多小時(shí)的時(shí)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。