文章列表

• 1.新东方背诵文选 L31 British Columbia
• British Columbia is the third largest Canadian provinces, both in area and population. It is nearly 1.5 times as large as Texas, and extends 800 miles...
• 2.新东方背诵文选 L32 Botany
• Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For many thousands of years it was the one field of aware...
• 3.新东方背诵文选 L33 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 sma...
• 4.新东方背诵文选 L34 Raising Oysters
• In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. First, farmers selected the oyster bed, cleare...
• 5.新东方背诵文选 L35.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 hu...
• 6.新东方背诵文选 L36.Plate Tectonics and Sea-floor Spreading
• The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outer layer of the Earth that includes all the crust a...
• 7.新东方背诵文选 L37 Icebergs
• Icebergs are among nature's most spectacular creations, and yet most people have never seen one. A vague air of mystery envelops them. They come into ...
• 8.新东方背诵文选 L38 Topaz
• Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine. Gem topaz is valuable. Jewelers call this variety of the sto...
• 9.新东方背诵文选 L39 The Salinity of Ocean Waters
• If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are impo...
• 10.新东方背诵文选 L40 Cohesion-tension Theory
• Atmospheric pressure can support a column of water up to 10 meters high. But plants can move water much higher; the sequoia tree can pump water to its...