摘要： The underline word “it in the second paragraph refers to “ . A. the energy benefit B. the forest loss C. climate change D. burning ethanol 推理判断 Passage 9 A volcanic eruption in Iceland has sent ash across northern Europe. Airlines have stopped or changed the flights across the Atlantic Ocean, leaving hundreds of passengers stuck in airports. Grirmsvom is one of the largest and most active volcanoes in Europe. What makes Grimsvom different is that it lies under a huge glacier of ice up to 12 maters thick. The hot volcano heats up the ice above it, which then forms a layer(层)of water between the glacier and the volcano This layer of water puts pressure on the volcano, keeping it stable, As the water flows out from under the glacier, the pressure lifts. The lava from the volcano then comes up to the surface. This is exactly what happened today. Now, airlines have to make changes to their flights so as not to fly through the clouds of volcanic ash. According to KLM, one of Europe’s biggest airlines, airplanes cannot go under the cloud or over it. Going through the cloud can result in ash getting stuck in the airplane’s engines, causing damage to the plane. The eruption has also caused problems for animals in Iceland. The volcano left ash and sharp Glass-like rocks all over the countryside. Farmers are keeping their animals inside to stop them from eating ash- covered grass to the sharp object.

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All too often , a choice that seems sustainable（可持续的）turns out on closer examination to be problematic. Probably the best example is the rush to produce ethanol（乙醇）for fuel from corn . Corn is a renewable resource —you can harvest it and grow more, almost limitlessly. So replacing gas with corn ethanol seems like a great idea.

One might get a bit more energy out of the ethanol than that used to make it, which could still make ethanol more sustainable than gas generally, but that’s not the end of the problem. Using corn to make ethanol means less corn is left to feed animals and people, which drives up the cost of food. That result leads to turning the fallow land — including, in some cases, rain forest in places such as Brazil — into farmland, which in turn gives off lots of carbon dioxide（CO2）into the air. Finally, over many years, the energy benefit from burning ethanol would make up for the forest loss. But by then, climate change would have progressed so far that it might not help.

You cannot really declare any practice “sustainable” until you have done a complete lift-cycle analysis of its environmental（环境的）costs. Even then, technology and public policy keep developing, and that development can lead to unforeseen and undesired results. The admirable goal of living sustainable requires plenty of thought on an ongoing basis.

What might directly cause the loss of the forest according to the text?

A. The growing demand for energy to make ethanol.

B. The increasing carbon dioxide in the air.

C. The greater need for farmland.

D. The big change in weather.

The underline word “it” in the second paragraph refers to

A. the energy benefit B. the forest loss

C. climate change D. burning ethanol

The author thinks that replacing gas with corn ethanol is

A. impractical B. acceptable C. admirable D. useless

What does the author mainly discuss in the text?

A. Technology. B. Sustainability.

C. Ethanol energy. D. Environmental protection.

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All too often , a choice that seems sustainable（可持续的）turns out on closer examination to be problematic. Probably the best example is the rush to produce ethanol（乙醇）for fuel from corn . Corn is a renewable resource ―you can harvest it and grow more, almost limitlessly. So replacing gas with corn ethanol seems like a great idea .

One might get a bit more energy out of the ethanol than that used to make it, which could still make ethanol more sustainable than gas generally, but that’s not the end of the problem. Using corn to make ethanol means less corn is left to feed animals and people, which drives up the cost of food. That result leads to turning the fallow land ― including, in some cases, rain forest in places such as Brazil ― into farmland, which in turn gives off lots of carbon dioxide（CO₂）into the air. Finally, over many years, the energy benefit from burning ethanol would make up for the forest loss. But by then, climate change would have progressed so far that it might not help.

57. What might directly cause the loss of the forest according to the text?

A. The growing demand for energy to make ethanol.

B. The increasing carbon dioxide in the air.

C. The greater need for farmland.

D. The big change in weather.

58. The underline word “it” in the second paragraph refers to “ ” .

A. the energy benefit B. the forest loss

C. climate change D. burning ethanol

59. The author thinks that replacing gas with corn ethanol is .

A. impractical B. acceptable C. admirable D. useless

60. What does the author mainly discuss in the text?

A. Technology. B. Sustainability.

C. Ethanol energy. D. Environmental protection.

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One might get a bit more energy out of the ethanol than that used to make it, which could still make ethanol more sustainable than gas generally, but that’s not the end of the problem. Using corn to make ethanol means less corn is left to feed animals and people, which drives up the cost of food. That result leads to turning the fallow land — including, in some cases, rain forest in places such as Brazil — into farmland, which in turn gives off lots of carbon dioxide（CO₂）into the air. Finally, over many years, the energy benefit from burning ethanol would make up for the forest loss. But by then, climate change would have progressed so far that it might not help.

1.What might directly cause the loss of the forest according to the text?

A. The growing demand for energy to make ethanol.

B. The increasing carbon dioxide in the air.

C. The greater need for farmland.

D. The big change in weather.

2.The underline word “it” in the second paragraph refers to “ ” .

A. the energy benefit B. the forest loss

C. climate change D. burning ethanol

3.The author thinks that replacing gas with corn ethanol is .

A. impractical B. acceptable C. admirable D. useless

4.What does the author mainly discuss in the text?

A. Technology. B. Sustainability.

C. Ethanol energy. D. Environmental protection.

查看习题详情和答案>>

All too often , a choice that seems sustainable（可持续的）turns out on closer examination to be problematic. Probably the best example is the rush to produce ethanol（乙醇）for fuel from corn . Corn is a renewable resource —you can harvest it and grow more, almost limitlessly. So replacing gas with corn ethanol seems like a great idea.
One might get a bit more energy out of the ethanol than that used to make it, which could still make ethanol more sustainable than gas generally, but that’s not the end of the problem. Using corn to make ethanol means less corn is left to feed animals and people, which drives up the cost of food. That result leads to turning the fallow land — including, in some cases, rain forest in places such as Brazil — into farmland, which in turn gives off lots of carbon dioxide（CO2）into the air. Finally, over many years, the energy benefit from burning ethanol would make up for the forest loss. But by then, climate change would have progressed so far that it might not help.
You cannot really declare any practice “sustainable” until you have done a complete lift-cycle analysis of its environmental（环境的）costs. Even then, technology and public policy keep developing, and that development can lead to unforeseen and undesired results. The admirable goal of living sustainable requires plenty of thought on an ongoing basis.

1.
What might directly cause the loss of the forest according to the text?
1. A.
  The growing demand for energy to make ethanol.
2. B.
  The increasing carbon dioxide in the air.
3. C.
  The greater need for farmland.
4. D.
  The big change in weather.
2.
The underline word “it” in the second paragraph refers to______.
1. A.
  the energy benefit
2. B.
  the forest loss
3. C.
  climate change
4. D.
  burning ethanol
3.
The author thinks that replacing gas with corn ethanol is ______.
1. A.
  impractical
2. B.
  acceptable
3. C.
  admirable
4. D.
  useless
4.
What does the author mainly discuss in the text?
1. A.
  Technology.
2. B.
  Sustainability.
3. C.
  Ethanol energy.
4. D.
  Environmental protection.

查看习题详情和答案>>

What might directly cause the loss of the forest according to the text?

The underline word “it” in the second paragraph refers to______.

The author thinks that replacing gas with corn ethanol is ______.

What does the author mainly discuss in the text?

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