1. What would gasoline give out if it were burned perfectly?
A) Nitrogen oxides.
B) Carbon monoxide.
C) Unburned hydrocarbons.
D) Carbon dioxide and water.
2. What will be the most possible consequence of gas emission?
A) Raising sea level.
B) Flooding coastal cities.
C) Changing global climate.
D) Endangering ozone level.
3. Hydrogen is a completely clean technology in that ________.
A) it eliminates much of pollution
B) it burns perfectly in all fuel cell
C) it imposes no environmental dangers
D) it only produces carbon dioxide and water
4. How can we produce more hydrogen in our homes?
A) By using electricity and water
B) By creating water in a fuel cell.
C) By converting water into oxygen.
D) By combining hydrogen with water.
5. One can obtain hydrogen from oil and natural gas by ________.
A) a fuel cell
B) a filter box
C) a filter pump
D) a fuel processer
6. Almost all the car companies plan to obtain the hydrogen for the fuel cells from gasoline because ________.
A) gasoline is the cheapest source of hydrogen
B) gasoline is a available source of hydrogen
C) gasoline is an environmentally sound source
D) gasoline is being used by many rich countries
7. The greatest part of the hydrogen economy lies in the derivation of hydrogen from ________.
A) fossil fuels
B) electrolytic water
C) renewable sources
D) hydrocarbon-molecules
8. The big problem with hydrogen involves its storage and transportation, for it is massive but not suitable for ________________.
9. There is an obstacle for the construction of hydrogen stations and the transportation infrastructure, which can be overcome with the advent of a dominant _______________.
10. Cars using gasoline-powered fuel-cell have such advantages over traditional ones as higher efficiency and less.________________.
文章梗概：
本文介绍了氢气经济的优势、问题和前景。引言部分指出燃烧矿物燃料的四大问题。第一个标题分析了氢气经济的四大优势。第二个标题介绍了氢气的两个来源——通过电解水或者改造矿物燃料获得氢气。第三个标题谈到了氢气的储藏和运输问题。第四个标题预测了氢气经济发展的未来状况。
答案解析：
1. 由题干关键词burned perfectly定位至引言部分第二段第一句……When cars burn gasoline, they would ideally burn it perfectly and create nothing but carbon dioxide and water in their exhaust. 汽车燃烧汽油时，理想状态下应该是完全燃烧，尾气中只应该有二氧化碳和水。因此D)为正确答案。
2. 由题干关键词 the most possible consequence定位至引言部分第六段第五句The ultimate effects are unknown, but it is a strong possibility that, eventually, there will be dramatic climate changes that affect everyone on the planet. 汽车尾气导致的最终结果尚不清楚，但最终极有可能导致全球气候的剧烈变化。因此C)为正确答案。
3. 由题干关键词Hydrogen和clean technology定位至第一个标题Advantages of the hydrogen economy下第一段第一点最后两句The only byproduct is water. There are also no environmental dangers like oil spills to worry about with hydrogen.氢气燃烧只会产生水，不必担心氢气会给环境带来威胁。因此D)为正确答案。这里的byproduct意为"副产品".
4. 由题干关键词produce more hydrogen和in our homes定位至第一个标题Advantages of the hydrogen economy下第一段最后一点Hydrogen can be produced anywhere that you have electricity and water.这句话说明了只要有电和水就可以在任何地方生产氢气。因此A)为正确答案。
5. 由题干关键词obtain hydrogen from oil and natural gas定位至第二个标题Where does the hydrogen come from?下第三段第二句Using a device called a fuel processor or a reformer, you can split the hydrogen off the carbon in hydrocarbon relatively easily and then use the hydrogen.可以使用能源处理器把碳从碳氢化合物中轻松分离出去并获得氢气。因此D)为正确答案。这里的split off意为"分离，分裂".
6. 由题干关键词 hydrogen和gasoline定位至第二个标题Where does the hydrogen come from?下第四段倒数第三句When you hear about "fuel-cell-powered vehicles"…, almost all of them plan to get the hydrogen for the fuel cells from gasoline using a reformer. 许多汽车公司正在研制的"燃料电池动力车"，他们都计划用能源处理设备从汽油中分离出氢气作为汽车的燃料电池。再结合倒数第二句The reason is because gasoline is an easily available source of hydrogen.因为汽油是方便可行的氢气来源。因此B)为正确答案。
7. 由题干关键词derivation of the hydrogen定位至第二个标题Where does the hydrogen come from?下第五段第二句To have a pure hydrogen economy, the hydrogen must be derived from renewable sources rather than fossil fuels……要发展纯粹的氢气经济，氢气必须从再生能源中获得，而不是从矿物燃料中获得。因此C)为正确答案。这里的renewable sources意为"再生能源，可更新能源"，fossil fuels 意为"矿物燃料".
8. 由题干关键词storage and transportation 以及massive but not suitable for定位至第三个标题How do you store and transport the hydrogen?下第一段第三句Compressing the gas requires energy, and compressed hydrogen contains far less energy than the same volume of gasoline. 压缩氢气需要能量，而且压缩后的氢气所包含的能量远远低于同样体积的汽油。据此，答案应改写为being compressed.
9. 由题干关键词obstacle，transportation和be overcome定位至第三个标题How do you store and transport the hydrogen?下第三段第三句Stations will not develop quickly until there is a storage technology that clearly dominates the marketplace. 只有在出现一种占市场主导地位的储存技术后，氢气站才会迅速发展起来。根据句意，结合题干中的dominant提示，答案应为storage technology.
10. 由题干关键词advantages over traditional ones和 higher efficiency定位至最后一个标题Prospect for the future下第二段第二句…fuel cells embody two major improvements over the internal combustion engine: they are about twice as efficient; they can significantly reduce air pollution in cities. 由此可见，题干是该句的同义转述，故空格处应填入air pollution.