新托福閱讀篇真題【精華版】

1、新托福閱讀篇真題【精華版】作者:日期:智課網(wǎng)TOEF備考資料新托福閱讀54篇真題【精華版】摘要：新托福閱讀54篇真題【精華版內(nèi)容下載】，每年參加托福閱讀考試的考生都會(huì)通 過各種途徑獲得托福閱讀真題的完整版題集，今天小編將整理的精華版新托福閱讀54篇真題分享給大家，做為沖刺階段的最后一頓大餐。新 托福 閱讀54篇真題的內(nèi)容全部來源于ETS官網(wǎng) 托福閱讀 真題題庫，每一篇托福閱 讀真題，我們都附有詳細(xì)的、具體的答案解析，希望考生們拿到這些內(nèi)容之后，能夠吃透新托福閱讀54篇真題的全部內(nèi)容。新托福閱讀54篇真題【節(jié)選】2013年5月真題With the onset of the Industrial

2、Revolution, knowing the age of rocks became a necessary prerequisite to finding industrial minerals, such as coal, iron, and the other materials that fueled and sustained the great Western industrialization of the eighteenth and nineteenth centuries. It was in the mining regions where engineers, who

3、 needed a better system for organizing the various types of rock scattered across Earth's surface, first grappled with scientific approaches to understanding the age of various rocks and the age of Earth. They realized that if the various rock units could he dated by their relative ages, correla

4、tions among even widely separated rocks could be established and from this, some order recognized.2015小馬托福新老托友交流群The pioneering European geologists first believed that identifying a rock's type would give them a strong clue to the age of the rock formation and that one of the most powerful clues

5、 came from the hardness of a given rock. Specific rock types were thus assumed to have formed at characteristically different rimes, the softest rocks having formed the most recently. This crude type of dating was first used to understand the way mountains were formed, In the mid-1700's it was t

6、hought that there were three distinct types of mountains in Europe, each formed by a different type of rock and each created at a different time. According to this theory, the oldest were the Alps,which had interior cores composed of very hard, crystalline rocks (such as granite, schist, or basalt).

7、 These mountains were called Primitive. Sitting on the flanks of the Primitive mountains were younger, smaller, Secondary mountains composed of layered sedimentary rocks such as limestone. They were often rich with fossils and intermediate in hardness. The youngest Tertiary mountains were composed o

8、f softer mudstones and sandstone. Rock type, hardness, and size thus established mountain type, and rock type also became a proxy for age. However, study soon exposed the fallacy of these early notions. It was discovered that some of the very high mountains were composed of the softest sediments and

9、 that even hard volcanic rock was sometimes found in very low mountains. By the early 1800's, it was understood that rock type was of no help in establishing age.Some people are concerned that our soils are becoming depleted of trace minerals by continuous agricultural use and hence that foocte

10、are becoming depleted in vital minerals. This is a complex issue about which not a great deal is known, but the lack of evidence of mineral deficiencies in our population speaks to the adequacy of our soils. Furthermore, soils are replenished in trace minerals by rainwater and especially by irrigation water that is obtained from rivers or wells that draw water from other soil or rock formations far away from the farm.以上就是有關(guān)新托福閱讀54篇真題的部分內(nèi)容介紹，完整版內(nèi)容需要考生點(diǎn)擊頁面中