更多"The use of solar power grew by 60% "的相关试题:
[简答题]81. In the past even as our power grew, much of the world saw us, rightly or wrongly, as a moral beacon, as a country somehow largely outside the bloody, gory, off-tyrannical history that carved its swath across so much of the world during the American Century. Indeed, in many ways, even as cultural elites in once-glorious Old World nations sneered at upstart, crass, consumerist America, the masses in those nations idealized America as some sort of Promised Land. In many ways, the American Dream of the last 100-some years has been more something dreamed by foreigners from afar, especially those who experienced fascism or Stalinism, than lived as a universal reality on the ground in the United States.
82. Things look simpler from a distance than they do on the ground. Today, I fear, foreigners slumber (酣睡) with dreamy American smiles on their sleeping faces no more; that intangible faith in the pastel-colored hue and soft contours of the Dream risks being shattered, repla
[单项选择]Today almost 70% of the electrical power we use comes from power plants that use fossil fuels (矿物燃料) to make electricity. Fossil fuels, such as oil, coal, and natural gas, are burned to make electricity. Burning fossil fuels releases pollution and carbon dioxide gas (CO2) into the air. The more fossil fuels we burn, the warmer the air around Earth gets. So building fossil fuel plans is not always the best answer.
Actually, there are other ways to make electricity without burning fossil fuels. People have been using the power of wind for centuries. Wind power won’t solve all our energy problems, but it can help meet some of the demands in certain places. Since the late 1800s, scientists have been working to turn the sun’s energy into electricity by using solar cells (太阳能电池). The problem is, solar cells are very expensive. Another way to make electricity is to use nuclear energy. It has been used for more than 50 years. Today about 10 percent of all the electricity used in the U.S.A
A. The Importance of Electricity
B. The Pollution of Making Electricity from Fossil Fuels
C. The Advantage of Using Nuclear Energy
D. Means of Making Electrical Power
[填空题]The member states of UN have the power to use force against other state to deal with the problems in international relations.
[填空题]A. its detecting power
B. millions of light years away in space
C. the location of the VLT
D. as an example
E. the birth of the earth
F. the rotation of the earth
The VLT will allow scientists to see events______.
[单项选择]The new power plant is reported（ ）within three years.
A. having been completed
B. to have been completed
C. to have completed
D. to complete
[填空题]A
Hydro power
Introduction
We have used running water as an energy source for thousands of years, mainly to grind com.
The first house in the world to be lit by hydroelectricity was Cragside House, in Northumberland, England, in 1878. In 1882 on the Fox River, in the USA, hydroelectricity produced enough power to light two paper mills and a house.
Nowadays there are many hydro-electric power stations, providing around 20% of the world’s electricity. The name comes from“hydro”, the Greek word for water.
How it works
A dam is built to trap water, usually in a valley where there is an existing lake.
Water is allowed to flow through tunnels in the dam, to turn turbines and thus drive generators.
Advantages
Once the dam is built, the energy is virtually free.
No waste or pollution produced.
Much more reliable than wind, so
