新东方在线职称英语频道(http://zhicheng.koolearn.com/)分享
electricity for about 300,000 people. Federal hydropower facilities produce about 17 percent of all hydropower produced in the United States.
Because of the growing US thirst for energy and increasing public unease with influence on foreign off sources，pressure on public lands to meet US energy demand is becoming more intense. Public lands are available for energy
development only after they have been evaluated through the land use planning process. If development of energy resources conflicts with management or use of other resources，development restrictions or impact moderation measures may be enforced，or mineral be banned altogether.
31. What is the main idea of this passage?
A Public lands are one of the main sources of revenues.
B Public lands play an important role in energy production.
C Public lands should be developed to ease energy shortage.
D Public lands store huge energy resources for further development.
32. Which of the following statements is true of public lands in the U.S.?
A The majority of undiscovered natural gas is stored there.
B Half of US energy is produced there.
新东方在线职称英语频道(http://zhicheng.koolearn.com/)分享
C Most of coal was produced from there in 2000.
D Most energy resources are reserved there.
33. Geothermal resources，wind turbines，and hydropower facilities in Paragraph 4 cited as examples to illustrate that
A the amount of alternative energy production from public lands is huge.
B alternative energy production is no less than conventional energy production.
C they are the most typical conventional energy resources from public lands.
D geothermal resources are more important than the other two。
34. There is a mounting pressure on public lands to satisfy US energy demands
A the U.S. is demanding more and more energy.
B many Americans are unhappy with energy development in foreign countries.
C quite a few public lands are banned for energy development.
D many Americans think public lands are being abused.
35. Public lands can be used for energy development when
A energy development restrictions are effective.
新东方在线职称英语频道(http://zhicheng.koolearn.com/)分享
B federal land managers grant permissions.
C they go through the land use planning process.
D there is enough federal budget.
参考答案：BAAAC
第二篇 Putting Plants to Work
Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels(太阳能电池板)for decades. But plants are the real experts. They’ve been using sunlight as an energy source for billions of years.
Cells in the green leaves of plants work like tiny factories to convert sunlight，carbon dioxide(二氧化碳)，and water into sugars and starches(淀粉)，stored energy that the plants can use. This conversion process is called photosynthesis(光合作用). Unfortunately，unless you’re a plant，it’s difficult and expensive to convert sunlight into storable energy. That’s why scientists are taking a closer look at exactly how plants do it.
Some scientists are trying to get plants，or biological cells that act like plants，to work as very small photosynthesis power stations. For example，Maria Ghirardi of the National Renewable Energy Laboratory in Golden. Colo.，is working with green algae(水藻). She’s trying to trick them into producing hydrogen instead of sugars
新东方在线职称英语频道(http://zhicheng.koolearn.com/)分享
when they perform photosynthesis. Once the researchers can get the algae working efficiently，the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity.
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthesis，plants normally make sugars or starches.“But under certain conditions，a lot of algae are able to use the sunlight energy not to store starch，but to make hydrogen.”Ghirardi says. For example，algae will produce hydrogen in an airfree environment. It’s the oxygen in the air that prevents algae from making hydrogen most of the time.
Working in an airfree environment，however，is difficult. It’s not a practical way to produce cheap energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate(硫酸盐)from the environment that the algae grow in，they will make hydrogen instead of sugars，even when air is present.
Unfortunately, removing the sulfate also makes the algae's cells work very slowly, and not much hydrogen is produced. Still, the researchers see this as a first step in their goal to produce hydrogen efficiently from algae. With more work, they may be able to speed the cells' activity and produce larger quantities of hydrogen.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and to feed, Ghirardi says, and they can grow
新东方在线职称英语频道(http://zhicheng.koolearn.com/)分享
almost anywhere： “You can grow them in a reactor, in a pond. You can grow them in the ocean. There's a lot of flexibility in how you can use these organisms.”
36. How do plants relate to solar energy?
A They are the real experts in producing it.
B They have been a source of it.
C They have been used to produce it.
D They have been using it for billions of years.
37. Scientists study how photosynthesis works because they want to
A improve the efficiency of it.
B turn plant sugars to a new form of energy.
C make green plants a new source of energy.
D get more sugars and starches from plants.
38. Algae are able to use solar energy to produce hydrogen when
A they are grown in narrow-necked bottles.
B there is enough oxygen in the air.
百度搜索“77cn”或“免费范文网”即可找到本站免费阅读全部范文。收藏本站方便下次阅读，免费范文网，提供经典小说教育文库2013年职称英语考试理工类B级试题及参考答案(3)在线全文阅读。
相关推荐：