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1.新东方优美背诵短文50篇 Unit44:Obtaining Fresh water from icebergs
44.Obtaining Fresh water from icebergs The concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the wo...
2.新东方优美背诵短文50篇 Unit43:Statistics
43.Statistics There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to...
3.新东方优美背诵短文50篇 Unit42:Coal-fired power plants
42.Coal-fired power plants The invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for a cheap, readily available fu...
4.新东方优美背诵短文50篇 Unit41:American Black Bears
41.American black bears American black bears appear in a variety of colors despite their name. In the eastern part of their range, most of these brown...
5.新东方优美背诵短文50篇 Unit40:Cohesion-tension Theory
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...
6.新东方优美背诵短文50篇 Unit39: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...
7.新东方优美背诵短文50篇 Unit38:Topaz
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 o...
8.新东方优美背诵短文50篇 Unit37:Icebergs
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...
9.新东方优美背诵短文50篇 Unit36: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...
10.新东方优美背诵短文50篇 Unit35: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...