题型：阅读理解 题类：常考题 难易度：普通
黑龙江省哈尔滨市第六中学2017-2018学年高一上学期英语期中考试试卷
Yawning（哈欠）sends out certain messages—either “Oh, this movie is boring" or "I probably need to get some sleep". But did you know that a yawn can also help your brain to cool down when it is so overheated?
A new study, led by a research team of Princeton University, has indicated（表明）that yawning could be the brain's natural way of regulating temperature. People yawn more often when the temperature outdoors is lower than their body temperature but are less likely to yawn when it is hotter outdoors, according to Sciencedaily.com.
The research team did an experiment on 160 people, 80 in summer and 80 in winter, to examine how often they yawned at different air temperatures. The study found that people yawned more often in winter than in summer. Scientists say that when the air temperature is lower outside the body, there is heat exchange between the overheated brain and the cool air. But when the air temperature is higher than or equal to the body, people are less likely to yawn because the hot air they breathe in will make the brain even hotter.
When people yawn, their jaw is also stretched, which increases blood flow and may also help cool the brain.
The study showed that the amount someone yawned could be related to the amount of time they spent outside. The longer they spent outside in summer, the less they yawn. Nearly 40 percent of participants yawned within their first five minutes outside, but after that the percentage was reduced to less than 10 percent.
However, the result was the opposite in winter. The number of people who yawned increased when they spent more than five minutes outdoors. But the change was only slight compared to summertime.
According to Gallup, this is the first report to show that yawning frequencies(频率) change depending on season. This could help us to understand better the way our brains work. It may also help us understand the reason why frequent yawning can sometimes be a sign of brain disease.
Three magical destinations just one day!
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Tour Code |
Adult |
Child(3-16) |
Student |
Family(2+2) |
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Tour203 |
￡94 |
￡84 |
￡89 |
￡346 |
TOUR DETAILS
Windsor Castle
Time-honored in history, Windsor Castle is proudly located on a wooded hill overlooking the Thames River. Dating back to Norman times, it is famous for sweeping landscaped gardens, which is easy to see why it's the Queen's favorite week place. Famous for its architecture and Royal palace, the Castle was built in the 11th century after the Norman invasion. It's home to priceless artworks and you can visit Queen Mary's Dolls' House. Remember don't miss the ceremony—Changing of the Guards.
Stonehenge
Stonehenge is located in the county of Wiltshire. This is your chance to see a side of the world-famous stones that most people don't get a chance to see! You will never forget your first glimpse of grand Stonehenge with its rocks rising up against the skyline on Salisbury Plain. There are many unsolved mysteries about the rocks. Was Stonehenge intended as a religious temple? A clock for astronomy? A burial ground? Make up your own mind as you explore this unique site that has confused the world for 5, 000 years.
Bath
Beautiful Bath was the first city in England to be added to the UNESCO World Heritage List. No tour of Bath would be complete with a visit to the famous Roman Baths that gave the city its name. This beautifully preserved bathing site still has flowing water from Brain's only hot spring. You will be amazed by the impressive torch-lighting ceremony as dusk falls. You can also have a taste of Bath's water in Pump Room, where hot waters are drawn for drinking.
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Islands that could disappear in your lifetime Island vacations are dreams for many tourists, but climate change has lifted ocean temperatures, raised sea levels and worsened storm severity. As a result, some islands are threatened and could disappear in the coming decades. |
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Federal States of Micronesia 2019 Population: 112,640 The average rate of sea-level rise worldwide has been 3.1 mm per year since 1993. But the rate around Federated States of Micronesia is three times faster. The country is at risk of disappearing because of coastal flooding, erosion, and frequent storms. |
Tuvalu 2019 Population: 11,508. Tuvalu is a small chain of islands in the Pacific Ocean. For more than 25 years, its representatives have raised alarms that climate change could raise sea levels enough to flood the islands. Even if waters never get that high, Tuvalu could still become uninhabitable as rising sea levels have polluted the nation's groundwater resources with salt. |
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Marshall Islands 2019 Population: 58413 Residents of Marshall Islands, a chain of volcanic islands and coral atolls in the central Pacific Ocean, have known for years that they have to either build new artificial islands to relocate or raise the existing ones. |
Shishmaref Alaska 2019 Population: 617 In 2016, people living in Shishmaref, Alaska, located near the Bering Strait, voted to relocate before melting ice and land erosion would forced them to. Alaska had granted the city $8 million toward the move, but officials say it will cost $200 million. |
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