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题型:阅读理解-七选五 难度:0.65 引用次数:132 题号:18396497

Antarctica is the highest, driest, and coldest place on Earth. It is also the remotest, a fact which demystifies its unspoiled environment. It is difficult for people to get there, and not a comfortable place for people to stay once they arrive.     1    

    2     .They never melt. Even though Antarctica receives more sunlight than the equator, the temperatures are lower because the ice sheet reflects the heat back into space. Thus, the coldest temperature ever recorded on Earth was in Antarctica in July, 1983. Soviet scientists shivered (瑟瑟发抖) through temperatures that fell to minus 89.2 degrees Celsius.

Once completely inaccessible,     3     gold, uranium and oil are just some of the valuable resources which lie beneath the continent’s icy covering.

For centuries, Europeans wondered about the existence of a South-pole continent, but no one actually knew for certain Antarctica was there until 1820 when European explorers “discover” it. Since then, men have gone to Antarctica in search of adventure, testing their abilities.     4    

    5     Damage to the environment occurs as people come looking for resources beneath the ice, or carelessly leave their garbage behind. Currently, countries are working to ensure that the damage to Antarctica’s environment is minimized, and that the last wilderness on Earth will remain an unspoiled place.

A.The cold climate is responsible for maintaining the continent’s year-round ice fields.
B.It is widely described as the last true wilderness on our planet.
C.Measures are being taken to protect Antarctica.
D.Yet, Antarctica’s fragile and complicated ecosystem is threatened by its human visitors.
E.In the icy covering are buried few precious resources,
F.Antarctica has more recently been playing host to adventurers seeking excitement and companies looking to exploit this wild zone for profit,
G.Several teams of explorers set out in 1911 to be the first men to stand at the South Pole.
【知识点】 科普知识 环境保护

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【推荐1】At the end of the last ice age, around 11,700 years ago, Earth’s climate began warming rapidly. As the planet heated up, its vast glaciers fell back. Almost immediately afterwards volcanic activity increased. That was nothing new. The geological record has plenty of evidence of big glacial disappearance that is followed by more frequent volcanic eruptions. Glaciers, in other words, seem to control volcanoes, which flourish in their absence.

This, at least, is the case for really big climatic swings. What has been less clear is whether more modest changes in ice cover might also affect the rate of eruptions. Given that humans are busy warming the planet, and therefore shrinking the few glaciers that still exist, this question matters. It would be good to know if more volcanic eruptions might be another consequence of global warming. In a paper just published in Geology, Graeme Swindles a geographer at the University of Leeds, suggests that it will — eventually.

The fine details of how glaciers are linked to volcanic eruptions are unknown. But volcanologists theorise that pressure is key. The idea is that the weight of large ice sheets press the crust and mantle below. That closes up channels within the rock through which magma travels towards the surface. It also leaves less room for surface water to make its way down into the rocks, where, as steam, it can increase the pressure within magma chambers. Remove the ice, by contrast, and those processes go into reverse.

Dr. Swindles and his colleagues studied layers of ash from Icelandic volcanoes that were deposited over Iceland and northern Europe during the relatively mild period since the end of the ice age, as well as volcanic sediments from Iceland itself. Their analysis revealed an unusual period between 5,500 and 4,500 years ago when no ash from Icelandic volcanoes found its way to Europe and when the sediment record from Iceland suggests that no major eruptions took place. When Dr Swindles compared the volcanic record with the climate literature, he found that the absence of eruptions came after a big change in atmospheric circulation patterns about 6100 years ago. That would have encouraged Iceland’s glaciers to advance. When conditions changed again a thousand years later, this time to favour glacial disappearance, volcanic activity picked up after a few hundred years.

Based upon these findings, Dr Swindles argues that even minor increases and decreases in glacier cover probably do affect volcanic activity, although with a time lag of perhaps five or six hundred years.

1. Why is the answer to whether changes in glaciation are related to the volcanic activity important?
A.The new ice age has started.B.There are more eruptions now.
C.Glaciers are gradually disappearing.D.It has long been a question of interest.
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【推荐2】Waking Up an Hour Earlier Can Help Fight Depression

Adequate (充足的) sleep is essential for maintaining good physical and mental health. Now, new research has revealed that good health also depends on sleep schedules. In fact, waking up an hour earlier is generally found to help prevent or fight against major depression.

This discovery was made in a study conducted by researchers from the University of Colorado in 2021. They found that waking up an hour earlier helps people who usually get up later improve their mood.     1    

This research adds to other similar studies which suggested that early risers tend to be healthier. At the same time, the fact that waking up an hour earlier improves the mood is associated with enjoying more hours of sunshine to a large extent.

The study started from the assumption that if people go to bed an hour earlier, they'll also wake up an hour earlier. Based on this idea, the researchers came to the conclusion that if people who go to bed at 3 am, decide to go to bed at 2 am, their risk of suffering from depression is reduced by 23 percent.     2    

    3     Generally they assumed that it's because daylight generates a large amount of hormonal (荷尔蒙的) impacts that affect mood. However, experts do not rule out (排除) the idea that non-early risers have a certain mismatch with social rhythms. This is because we live in a society that focuses more on daytime activities.     4     In fact, being a night owl effectively means giving up a "normal life".

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F.If they went to bed at 1 am, the risk reduction could be as much as 40 percent.
G.Therefore, not keeping with that social rhythm can cause certain feelings of inadequacy.
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【推荐3】Thanks to Earth, we have fresh air to breathe, clean water to drink and warm sunshine to enjoy. But it seems that we may have taken these things for granted and not realized that our planet is getting “sick”.     1     . More than 15,000 researchers around the world have written a letter to warn about environmental threats.

Among those environmental challenges, global warming sits at the top. Global average temperatures have risen by more than 0.5℃since 1992.     2     It means that heat waves would last around a third longer and rainstorms would be about a third more intense (猛烈的) if we take no action. The increase in sea levels would also be much higher. Countries like Singapore and Tokyo that are at low altitudes may be covered by the ocean in the future.

    3     . It’s getting harder to get fresh water. Ocean pollution has become serious. Since 1992, the human population has grown by 2 billion, while the populations of all other animals have dropped by nearly 30 percent.


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F.Some rare animals, like black rhinos, might just appear in the pictures soon
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