【題目】閱讀下面短文，根據(jù)其內(nèi)容寫(xiě)一篇60詞左右的內(nèi)容概要。

Are you sick of going to bed late and waking up tired? Then grab your hiking boots and a tent. A new study suggests that a couple days of camping in the great outdoors can reset your circadian (晝夜節(jié)律的)clock and help you get more sleep.

The circadian clock, more commonly known as the body clock, is an internal system that tells our bodies when it's time to go to sleep and when it's time to wake up. Scientists track this clock by measuring the amount of melatonin(褪黑激素)circulating in a person’s blood at any given time. In a healthy sleeper, melatonin levels rise a few hours before bedtime, stay high through the night, and then settle back down when it's time to wake up.

In our modern society, however, most of us stay up many hours past sunset and would probably sleep in many hours after sunrise if we could. And the trouble is that your melatonin levels may still be high when your alarm clock goes off in the morning, which leads to grogginess(頭暈眼花). It may also have other health consequences as well, such as diabetes(糖尿病), overweight problems and heart disease

Professor Kenneth P. Wright of the University of Colorado in the US wanted to see if our body clocks can be reset by a short stay in nature. His team recruited (招收)14 physically active volunteers in their 20s and 30s. Nine went on a weekend camping trip, while the other five stayed home. At the end of the weekend, the researchers reported that in just two days, the campers' body clocks had shifted so that their melatonin levels began to rise more than an hour earlier than they did before they left on the trip. By contrast, the body clocks of the group that stayed home shifted even later over the course of the weekend. 'This tells us we can reset our clocks fast, ' Wright said.

Therefore, if you want to change your sleep patterns you could try to increase your exposure to natural light during the day and decrease the amount of artificial light you see at night.

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【答案】A new study shows that outdoor camping can reset a person's circadian clock and improve sleep. (要點(diǎn)1)The circadian clock, an internal system, schedules your sleeping time guided by the amount of melatonin. (要點(diǎn)2)But people's irregular sleeping habit disturbs the rise and fall of melatonin, which causes tiredness and diseases. (要點(diǎn)3)Wright's experiment proved that our clocks can be reset. (要點(diǎn)4)So we'd better expose ourselves to natural light more in the daytime and artificial light less in the evening. (要點(diǎn)5)

【解析】

這是一篇概要寫(xiě)作。本文是一篇說(shuō)明文，文章主要介紹了生物鐘對(duì)人體的影響，以及調(diào)節(jié)生物鐘的方法。

通讀全文，我們可以從以下五個(gè)方面對(duì)本文進(jìn)行概括：一項(xiàng)研究表明，去室外野營(yíng)可以調(diào)節(jié)生物鐘改善睡眠；生物鐘是決定睡眠的內(nèi)在系統(tǒng)，受褪黑素的影響；不規(guī)律的睡眠導(dǎo)致褪黑素?cái)?shù)量不穩(wěn)定，進(jìn)而引起其他健康問(wèn)題甚至疾��；Wright教授的實(shí)驗(yàn)證明野營(yíng)可以重置生物鐘；總之，多曬自然光、減少人造光對(duì)生物鐘有好處。

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