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题型:阅读理解-阅读单选 难度:0.85 引用次数:35 题号:16645839

Name an active volcano: Fuji, Vesuvius, Mt. St. Helens, or even Iceland’s infamous Eyjafjallajokull—every single one of them has a decent-size population at the base, and some of them have full-blown big cities. Why do people choose to live near a ticking time bomb?

It all starts with the soil. The molten (熔化的) rock that pours forth during a volcanic eruption is known as magma (岩浆) when it’s underground, and lava once it reaches the surface. Magma takes other things up with it—minerals and nutrients that are then broken down to make the soil extra productive. The result is that on volcanic soil, tomatoes grow bigger, beans grow greener, and flowers grow brighter.

In Mexico, the active Popocatepetl and the inactive Iztaccihuatl are at the center of a centuries-old legend, and the Aztecs certainly weren’t going to abandon the place most closely associated with their cultural heroes. Meanwhile, in Iceland, the cruelty of the volcano Hekla became a point of pride. Some Christians on the island believed it was literally a gateway to Hell, while others told a tale of an evil magician driven off by the volcano’s lava bombs.

That explains why people have been living near volcanoes since the dawn of man. But as technology has advanced, the benefits of volcanoes have only increased. In Iceland and New Zealand, for example, geothermal energy plants have come to play a primary role in keeping the countries’ lights on. That wouldn’t be possible without the volcanoes that created the islands in the first place. Plus, the unmatched sights created by volcanic networks aren’t just pleasant to live near; they’re also a major draw of tourist dollars. That kind of thing can’t be ignored.

Whatever the draw, it’s clear that volcanoes have a lot to offer the people who live in their shadows. Living near a volcano is a lot like betting, but in this case, you’re going to want to get out before things get too hot.

1. Why are some volcanoes mentioned in Paragraph1?
A.To introduce a volcano-related topic.B.To make comparisons between them.
C.To show how important volcanoes are.D.To highlight the most famous one worldwide.
2. What is Paragraph 3 mainly about?
A.Some active and inactive volcanoes worldwide.
B.Associations between city heroes and volcanoes.
C.Some unbelievable beliefs and cruelty of volcanoes.
D.The cultural role volcanoes play in some civilizations.
3. What can be inferred from Paragraph 4?
A.Technology plays a key role in a country.B.Volcanoes can generate economic profits.
C.Volcanoes created some island countries.D.It is vital to build a network of volcanoes.
4. What is the best title for the text?
A.How Can Volcanoes Serve the Locals?
B.Where Do People Actually Choose to Live?
C.Why Do People Live near Active Volcanoes?
D.What Will Volcano Tourism Go in the Future?
【知识点】 说明文 人与环境

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文章大意:这是一篇说明文。短文介绍了维生素C有诸多好处还没有得到证实,对一些人来说,服用维生素C要慎重。

【推荐1】In large population studies, people who eat lots of fruits and vegetables high in vitamin C appear to have a reduced risk for various types of cancer, including cancers of the mouth and lung. But it’s not clear that these benefits come specifically from vitamin C. The Age-Related Eye Disease Study found that a daily supplement containing 500 mg of vitamin C can help slow the progress of macular degeneration, an age-related eye disease that causes vision loss. But we don’t know what benefits, if any, are provided by vitamin C in particular.

Many people take vitamin C supplements in unnecessarily high doses to prevent or treat various conditions for which its effectiveness is unproved. The vitamin C supplements have variously been said for staving off sunburn and improving the appearance of wrinkles. None of these benefits have been confirmed in scientific studies.

Perhaps the best-known and most widely promoted use of high-dose(高剂量)vitamin C is to prevent or treat the common cold. Most of the evidence shows that high-dose vitamin C will, at most, shorten a cold by one day. In ordinary circumstances, vitamin C has no preventive value, although a few studies have reported a 50% reduced risk of developing colds among people taking vitamin C in extreme circumstances-for example, skiers, marathon runners, and soldiers working in extreme conditions.

The recommended vitamin C dosage per day for healthy women is 75 mg per day. For adults, the highest safe daily intake is likely to be 2, 000 mg per day. Vitamin C is water-soluble, so any amount more than you need will not be stored in the body. It’s safe in almost any amount from foods, and supplements in recommended amounts are also regarded as safe for most people. In some people, high doses-more than, say, 2, 000 or 3, 000 mg per day-can cause a variety of symptoms. People with kidney conditions should take no more than 1, 000 mg a day.

1. What can we learn about vitamin C in the first paragraph?
A.It can be of better effect in higher doses.
B.It can be a cure for age-related eye disease.
C.It can help slow the progress of some illness.
D.It can reduce the risks of the mouth cancer.
2. What function does vitamin C have intreating the common cold?
A.It can help people save plenty of money.
B.It can stop soldiers from catching a cold.
C.It may reduce a cold by one day at most.
D.It may prevent the common cold efficiently.
3. How much Vitamin C are healthy women advised to take per day?
A.75 mg.
B.500 mg.
C.2, 000 mg.
D.3, 000mg.
4. Where is this text probably taken from?
A.An exam paper.
B.A travel journal.
C.An art guidebook.
D.A science magazine.
2023-03-19更新 | 211次组卷
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【推荐2】Smart phones are greatly changing the way we walk down the street. Office workers and young people are walking like the old as they check emails and messages.

Scientists have found mobile phones make us walk more slowly, with modest steps, to avoid falling over. The leader of the study said the walk is just like someone in their eighties. Researchers found people writing a text message walk more than twice as slowly as those without a phone, finding it harder to stay in a straight line.

The scientists examined 252 people walking while reading a text message, writing one, speaking on their phones or without their phones at all. Writing a text is the hardest activity, causing people to look down at their phone 46 percent more, and 45 percent longer, than when reading a message. This led people to walk 118 per cent more slowly than when they were without their phones. People walked almost a third more slowly while reading a text and 19 per cent while talking on the phone.

Smart phones were found to stop people from walking in a straight line, putting them at greater risk of running into other people, cars or street lamps. This increased the need to slow down and take more careful steps.

John Timmis said the idea for this study came from following someone walking down the street in the afternoon, who was walking as if he had had several drinks. I thought it was a bit early for that, then walked up alongside him and saw that he was on his phone. Simply being on the phone changes the way people walk.

1. What does the underlined word “modest” mean in the second paragraph?
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EcoRoots

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Made Trade

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