C. Kids stood or sat on the ground floor to study on the first day.
D. Kids' parents earned the desks for them.
1—3、BDA
***************************************************结束
B.
The United States is the world's largest consumer of energy. We use electricity, gas and oil to light and heat our buildings and run our cars. The demand for power is growing. But we may not need to build new power plants for or find more oil. The best way to increase our supply of energy is to be more efficient.
Did you know that when you leave your video-game console on, it consumes more electricity than two refrigerators? Or that those funny-looking, twisty bulbs use 75% less power than traditional light bulbs? We have the tools to save money, reduce pollution and even help our planet, simply by wasting less energy.
As President, Barack Obama plans to make energy efficiency in American a major goal. He has pledged to cut 15% of all energy used by the Federal Government. In a speech, he called for 75% of government office buildings to be updated for better efficiency. He pointed out that energy-efficient buildings and homes will save consumers billions of dollars on energy bills. An "extra benefit", he added, will be "a cleaner, safer planet."
Gas, coal and oil are called fossil fuels. Fossil fuels have been the world's main source of energy for hundreds of years. But burning them releases dirty gases, which cause pollution.
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