题目内容
A greenhouse is a building _______ of glass _______ for keeping plants warm when the outside temperature is low..
| A．made, which is used | B．which is made, is used |
| C．made, being used | D．is made, used |
A
解析
Scientists have long understood the key role that oceans play in controlling the Earth’s climate. Oceans cover 70 per cent of the surface of the globe and store a thousand times more heat than the atmosphere does. What’s newer is the understanding of how this key component(组成部分) of our climate system responds to global warming.
A brake on global warming—for now
One of the oceans’ most important climate functions is absorbing heat and carbon dioxide(CO2), one of the gases that causes global warming. Acting as something absorbing heat, the oceans have absorbed huge amounts of heat and CO2 in the last forty years.
Fujita explains, “the oceans are saving us from faster climate change—they are putting a brake on the climate system.”
“That’s the good news,” he adds. “The bad news is that the oceans only slow the atmospheric warming. Once the oceans come to balance with a greenhouse-gas warmed earth, the extreme heat will remain in the atmosphere and things will get much hotter.” But where and how the oceans release this slowly increased heat is uncertain. And as the ocean stores heat, fragile(脆弱的) underwater ecosystems are struggling.
The most recent scientific report from the Intergovernmental Panel on Climate Change(IPCC) also notes with concern that the ocean is acidifying(酸化) because of increased absorption of atmospheric CO2. and thus causing a threat to shell-forming species. Sharp increase in CO2 levels will cause further acidification of the ocean.
Currents distributing heat
Another important role the oceans play is that of distributor(散布者). Oceans deliver heat and life-sustaining nutrition around the globe. Just as blood tube bring oxygen and nutrition to cells in the human body, the ocean’s currents carry oxygen, nutrients and heat throughout the Earth. The ocean distributes 25 to 50 per cent of energy the planet receives from the sun. For example, the Gulf Stream carries heat across the Atlantic. This warm current gives northwestern European a milder climate that it would normally have so far north. A change to the ocean’s circulation patterns could throw Europe into a colder period, even as the rest of the world is experiencing warmer temperatures.
【小题1】 We can infer from the passage that _______.
| A．the oceans cause global warming | B．the oceans stop global warming |
| C．the oceans release nutrients and heat | D．the ocean ecosystems face more dangers |
- produce oxygen and nutrients around
- absorb 25-50% of the energy from the sun
- distribute the atmosphere hotter
【小题3】 Which of the following are the results of the ocean absorbing heat and CO2?
a. It causes further acidification.
b. It makes the atmosphere hotter.
c. It balances the oceans with a green-house gas.
d. It affects shell-forming species.
e. It makes the oceans act as a heat sponge.
f. It controls the Earth’s climate.
| A．a-c-f | B．a-d-f | C．b-d-e | D．b-c-e |
| A．Asia would suffer a hotter climate. |
| B．Europe would become hotter |
| C．the rest of the world would become warmer. |
| D．the climate of Europe would become colder. |
A green house is a building made of glass which is used for keeping warm when the outside temperature is low. In a similar way there are several gases in the atmosphere (mixture of gases that surround the earth) which trap the heat produced by the sun and prevent it from escaping. These gases are known as “greenhouse gases”. and the way in which they trap heat in the atmosphere is called the “greenhouse effect”. This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere, and without them the earth would be 30 degrees colder and human life would not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us.
The problem is that in the last century and a half, we have been putting too many of these gases into the earth’s atmosphere by burning large quantities of coal and oil and by cutting down forest. The rapid increase in greenhouse gases is making the world warmer. The world’s temperature has already gone up by half a degree this century, and the sea level has risen by 10 centimetres. If the amount of carbon dioxide in the atmosphere doubles, there will probably be a rise in the earth’s temperature of between I and 4℃;. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some areas would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about 30 years in the greenhouse effect. This means that we are probably experiencing only now the effect of the gases put into the atmosphere before the 1960s. Since then, our use of these gases has greatly increased.
1. According to the passage, we can know “greenhouse effect” means_______.
|
A．the way in which gases are used for keeping plants warm |
|
B．a natural course that is to a certain degree useful to us |
|
C．the way “greenhouse gases” trap heat on the earth |
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D．the whole course in which greenhouse gases prevent heat |
2. If there were no greenhouse effect,_______.
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A．all plants would not grow on our planet |
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B．soil would reduce the temperature by 30 degrees |
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C．man would breathe the cleaner air |
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D．people couldn’t live in the earth |
3. Which of the following is not true?
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A．Burning too much coal and oil produces lots of greenhouse gases. |
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B．It has become warm on the earth now than in the past. |
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C．Gases put into the atmosphere now will affect the earth years later. |
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D．The temperature in a greenhouse is as high as that in the atmosphere. |
4. Suppose the earth’s temperature rose by 3 degrees, _______.
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A．great harm will be done to mankind |
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B．the sea level would go up by 10 centimeters |
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C．all the land in the world would be flooded |
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D．crops would be unable to grow on the earth |
5. This passage mainly deals with ________.
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A．the concept (概念) and the harm of the greenhouse |
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B．the relation between greenhouse gases and man |
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C．the concept and change of greenhouse effect |
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D．the effect of the rise of the earth’s temperature |