文章列表

• 1.考研背诵50篇——40 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...
• 2.考研背诵50篇——39 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...
• 3.考研背诵50篇——38 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...
• 4.考研背诵50篇——37 Icebergs
• Icebergs are among natures most spectacular creations, and yet most people have never seen one. A vague air of mystery envelops them. They come into b...
• 5.考研背诵50篇——36.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...
• 6.考研背诵50篇——35.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 hundre...
• 7.考研背诵50篇——34 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...
• 8.考研背诵50篇——33 Plankton
• 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...
• 9.考研背诵50篇——32 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...
• 10.考研背诵50篇——31 British Columbia28.Changing Roles of Public Education
• 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 mile...