【题目】Many Americans concerned about pollution are demanding cleaner supplies of energy. The demand has resulted in increased research about ethanol fuel. Ethanol is an alcohol that can be mixed with gas. It burns up most of the pollutants in gas. It replaces some of the chemicals that are known to cause cancer, and it can be produced in the United States.

Some experts say that in the future ethanol will replace some of the oil imported into America. Today ethanol is less than one percent of total American fuel supply. The head of the National Corn Growers Association, Kieve Hard, says ethanol will provide twenty-five percent of the fuel supply by 2030. The organization is involved in the production of ethanol because it can be made from corn.

One company in the American Midwest says it is starting to produce ethanol because of demands from people and from the government. The Congress approved the Clean Air Act in 1990. The company says this means the market for ethanol will expand. The company is a major producer of corn starch that can be used to make ethanol.

At Texas A and M University Professor Mark Holzapple produces ethanol from materials found in solid waste. He has developed a way to turn materials like paper into simple sugar. He then uses yeast to turn the sugar into ethanol. Professor Holzapple says two hundred liters of ethanol fuel can be produced from one ton of solid waste.

A professor at the University of Arkansas, John Geddie, is exploring another way to make ethanol. He is using acids on paper material. He says a large factory could produce ethanol from waste paper at a cost about the same as the cost of producing gasoline.

Environmentalists support the use of ethanol because it turns solid waste into a useful product. Professor Holzapple says law makers in industrial nations need to support the development of this clean, less expensive fuel of the future.

【1】Why does the interest in ethanol fuel increase in the United States according to the passage?

A. Ethanol products are known to cause cancer.

B. Ethanol can remove some harmful pollutants from gas.

C. The production of ethanol is protected by law.

D. Ethanol-fueled automobiles are cheaper than gas-fueled ones.

【2】In this passage, what is the significance of the Clean Air Act passed by American Congress in 1990?

A. It will increase the consumers’ demand for ethanol as a fuel.

B. It may increase the cost of producing gas.

C. It reflects the view of the government on automobiles production.

D. It limits the ethanol production of one company in the American Midwest.

【3】The author mentions all of the following resources for making ethanol except____.

A. corn starch B. natural gas

C. waste paper D. solid waste

【4】What does Professor Mark Holzapple think of the development of ethanol in countries?

A. It needs the cooperation of many chemists.

B. It associates with the use of advanced equipment.

C. It will improve the use of heat from exhaust gases.

D. It requires the support of the government.

【题目】The stranger to walk into the building in the early morning was probably a salesman.

A. seen B. to see

C. to be seen D. seeing

【题目】Ladies and gentlemen，please return to your seat and fasten your safety belt. Our plane_________.

A. takes off B. is taking off

C. has taken off D. will be taking off

【题目】I can’t tell you _____way to the Wilsons’ because we don’t have ___Wilson here in the village.

A. a； the B. the ；/

C. a； / D. the ； a

【题目】The ___look on his face told us that he felt _____to be asked such a question.

A. astonished；astonished B. astonishing；astonished

C. astonished；astonishing D. astonishing；astonishing

【题目】Please call my secretary to arrange a meeting this afternoon，or __________ it is convenient to you.

A. whenever

B. however

C. whichever

D. wherever

【题目】阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或用括号中词语的正确形式填空，并将答案填写在答题卡标号为1～10的位置上。

Scientists have discovered that __【1】____(stay) in the cold could help us lose weight. Researchers at the University of California found that exposure to the cold increases levels of a protein that helps form brown fat -------- the type of fat that produces heat and keeps us warm. Brown fat burns energy, ___【2】____ helps us lose weight. White fat stores extra energy, which results __【3】____ weight gain. The researchers said that because air conditioning and heating give us constant, ___【4】____ (comfort) temperatures, our body's need for brown fat has decreased. They found that: "Outdoor workers in northern Finland who __【5】____ (expose) to cold temperature have __【6】____ significant amount of brown fat when ___【7】___ (compare) to same-aged indoor workers."

The research was conducted on two different control groups of mice. __【8】____ group was injected with the protein that helps create brown fat. This group later gained 30% less weight after both groups were fed high-fat diets. The researchers say this could be good news in the fight against obesity. People who are obese have ___【9】____（low) levels of brown fat than thinner people. Head researcher Hei Sook Sul said: "This protein could become an important target for research into the treatment and prevention of obesity and obesity-related diseases." She added: "If you can somehow increase levels of this protein, you could __【10】____ (possible) lose more weight even if eating the same amount of food."

【题目】__________ volleyball is her main focus , she's also great at basketball.

A. Since

B. Once

C. Unless

D. While

【题目】Air travel makes some people very nervous. The crowds, the noise and flying itself can cause . But there are classes people can take to help them the fear of flying. And there is training for service dogs that suffer the same problem.

Service dogs almost never the side of the people they care for. You will see them working on buses, trains and other public systems. But the busy environment found at an airport can even the best trained working dog.

People with disabilities depend on their dogs. They want the animals to safely them through security areas. They also need the dogs to remain on duty on the airplane, even when the flying is not . This takes special . The Air Hollywood K9 Flight School is one place where such help can be found.

The school has a piece of equipment that provides the sights, sounds and even the feel of an airplane in flight. Dog trainers say training is based on a simple rule: preparation. Dogs need to be exposed gradually and to the environment, to loud noises, to sounds and other dogs so that when this experience happens to them on a daily basis, they're able to act in a way that they're used to acting and that they don't get .

Dog owners who the training at Air Hollywood K9 Flight School say they now feel much more at ease about future . Their dogs also seem ready for takeoff.

【1】A. trouble B. span>unease C. accidents D. diseases

【2】A. defeat B. describe C. sense D. record

【3】A. professional B. varied C. free D. similar

【4】A .approach B. bark C. leave D. take

【5】A. association B. running C. transport D. society

【6】A. trouble B. attract C. interrupt D. instruct

【7】A. follow B. guide C. train D. land

【8】A. nervously B. stressfully C. calmly D. enthusiastically

【9】A. speedy B. relaxing C. dangerous D. smooth

【10】A. interest B. attention C. training D. procedure

【11】A. previous B. cooperative C. academic D. successful

【12】A. repeatedly B. abruptly C. occasionally D. instantly

【13】A. bored B. excitable C. energetic D. fragile

【14】A. attended B. inquired C. overlooked D. recommended

【15】A. career B. flights C. security D. generations

【题目】It took me a long time before I was able to fully appreciate what they __________ for me.

A. had done

B. did

C. would do

D. were doing