Oil Refining An important new industry, oil refining, grew after the Civil war. Crude oil, or petroleum - a dark, thick ooze from the earth - had been known for hundreds of years, but little use had ever been made of it. In the 1850's Samuel M. Kier, a manufacturer in western Pennsylvania, began co

新东方优美背诵短文50篇 Unit33:Plankton浮游生物33 Plankton浮游生物.Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about lazily with the currents, providing a basic food for man

Tell me not in mournful numbers,Life is but an empty dream!For the soul is dead that slumbersAnd things are not what they seem.请别用哀伤的诗句对我讲；人生呵，无非虚梦一场！因为沉睡的灵魂如死一般，事物的表里并不一样。Life is real! Life is earnest!And the grave is not its goalDust thou art, to dust returnest,Was not spoken of the soul.人生是实在的！人生

新东方优美背诵短文50篇 Unit30:The origin of Refrigerators30 The origin of RefrigeratorsBy the mid-nineteenth century, the term &ldquoicebox&rdquo had entered the American language, but ice was still only beginning to affect the diet of ordinary citizens in the United States. The ice trade grew with the growth

新东方优美背诵短文50篇 Unit42:Coal-fired power plants42.Coal-fired power plantsThe invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for a cheap, readily available fuel with which to generate large amounts of electric power. Coal seemed to fit the bill, and it fueled the ea

新东方优美背诵短文50篇 Unit45:The Source of Energe45.The source of EnergyA summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun in fact, at the Sun&rsquos very center. It is here that is to be found the source of the energy that the Sun constantly pours out into spa

Ronald Reagan: The Space Shuttle "Challenger" Tragedy Address"We'll continue our quest in space. There will be more shuttle flights...more volunteers, more civilians, more teachers in space."Ladies and Gentlemen, I'd planned to speak to you tonight to report on the state of the Union, but the events

John F. Kennedy: Address to the Greater Houston Ministerial Associationdelivered 12 September 1960 at the Rice Hotel in Houston, TXVideo Stream of AddressAudio mp3 of AddressAudio mp3 Stream of AddressReverend Meza, Reverend Reck, I'm grateful for your generous invitation to state my views.While the