Corn is a very useful plant that can be prepared many different ways. A.inB.onC.byD.for 题目和参考答案——青夏教育精英家教网—

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.

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.

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.

People eat different things in different parts of the world.
In some countries, people eat   36  every day. Sometimes they eat it two or 37  times a day, for breakfast, lunch and supper. They can   38  it, fry it or make it into rice flour（面粉）. They usually eat it   39  meat, fish and vegetables.
Some people do not eat some kind of   40 . Muslims, for example, do not eat pork.
The   41   eat a lot of fish. Japan is an island and its   42  go all over the Pacific looking for fish to   43 . The Japanese sometimes eat uncooked fish, and they also eat a lot of rice.
In   44  such as Britain and the United States of America, the most important food is   45  or potatoes. People there usually make their bread from wheat flour. They   46  potatoes in different ways. They can boil them and fry them.
In Africa, corn is the most important   47  like rice and wheat. Corn is a kind of cereal（谷类食物）. African people make the corn   48  flour. From the flour they make   49  kinds of bread and cakes. Many Africans are very   50  and so they can’t afford to eat much   51  with their cereal.
Cereal and meat are very important, but we also   52  plenty of vegetables and lots of fresh fruit.
Some people   53  only fruit and vegetables. They do not eat meat or fish or 54  that comes from animals. They eat only food from   55 . Some people say that food from plants is better for us than meat.

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 (CO) 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 life-cycle analysis of its environmental(环境的) costs. Even then, technology and public keep developing, and that development can lead to unforeseen and undesired results. The admirable goal of living sustainably requires plenty of thought on an ongoing basis.

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 underlined 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

People eat different things in different parts of the world.

In some countries, people eat 36 every day. Sometimes they eat it two or 37 times a day, for breakfast, lunch and supper. They can 38 it, fry it or make it into rice flour（面粉）. They usually eat it 39 meat, fish and vegetables.

Some people do not eat some kind of 40 . Muslims, for example, do not eat pork.

The 41 eat a lot of fish. Japan is an island and its 42 go all over the Pacific looking for fish to 43 . The Japanese sometimes eat uncooked fish, and they also eat a lot of rice.

In 44 such as Britain and the United States of America, the most important food is 45 or potatoes. People there usually make their bread from wheat flour. They 46 potatoes in different ways. They can boil them and fry them.

In Africa, corn is the most important 47 like rice and wheat. Corn is a kind of cereal（谷类食物）. African people make the corn 48 flour. From the flour they make 49 kinds of bread and cakes. Many Africans are very 50 and so they can’t afford to eat much 51 with their cereal.

Cereal and meat are very important, but we also 52 plenty of vegetables and lots of fresh fruit.

Some people 53 only fruit and vegetables. They do not eat meat or fish or 54 that comes from animals. They eat only food from 55 . Some people say that food from plants is better for us than meat.

1.A. fish B. meat C. rice D. wheat

2.A. five B. four C. one D. three

3. A. boil B. drink C. eat D. have

4. A. as B. like C. together D. with

5. A. apples B. fish C. meat D. vegetables

6. A. Americans B. Chinese C. English D. Japanese

7.A. fishing boats B. lifeboats C. planes D. trains

8.A. buy B. catch C. hold D. weigh

9. A. developing B. Eastern countries C. the world D.Western countries

10. A. bread B. cakes C. rice D. vegetables

11.A. cook B. eat C. make D. take

12.A. food B. meal C. pork D. thing

13.A. from B. into C. of D. up of

14.A. all B. different C. the same D. two

15.A. healthy B. poor C. rich D. weak

16. A. corn B. meat C. rice D. wheat

17.A. buy B. like C. need D. plant

18. A. cook B. eat C. harvest D. hate

19. A. anything B. pork C. rice D. vegetables

20.A. apples B. fish C. pigs D. plants

Corn is a very useful plant that can be prepared ________ many different ways.

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