托福阅读真题经典加试 软件汇总下载.docx

智课网TOEFL备考资料托福阅读真题经典加试+软件汇总下载 摘要： 托福阅读真题经典加试+阅读学习软件汇总下载 ，今天小编将花费了大量时间和精力的托福阅读经典加试+阅读学习软件分享给大家，软件只需下载一次即可终生使用，不收取任何费用。 托福 阅读题正常来说一般就3道，如果你在考场上抽到了 托福阅读 加试题，那么总共就5道题，但是令人兴奋的是，托福阅读真题经典加试题就是一个小题库，里面的内容不是很多，今天小编将托福阅读真题经典加试的所有提醒展示给大家，不管我们在接下来的考试中出了什么经典加试内容，就都不用担心了。 托福阅读真题经典加试部分内容：Question 1-8 When Jules Verne wrote Journey to the Center of the Earth in 1864, there were many conflicting theories about the nature of the Earths interior. Some geologists thought that it contained a highly compressed ball of incandescent gas, while others suspected that it consisted of separate shells, each made of a different material. Today, well over a century later, there is still little direct evidence of what lies beneath our feet. Most of our knowledge of the Earths interior comes not from mines or boreholes, but from the study of seismic waves - powerful pulses of energy released by earthquakes. The way that seismic waves travel shows that the Earths interior is far from uniform. The continents and the seabed are formed by the crust - a thin sphere of relatively light, solid rock. Beneath the crust lies the mantle, a very different layer that extends approximately halfway to the Earths center. There the rock is the subject of a battle between increasing heat and growing pressure. In its high levels, the mantle is relatively cool; at greater depths, high temperatures make the rock behave more like a liquid than a solid. Deeper still, the pressure is even more intense, preventing the rock from melting in spite of a higher temperature. Beyond a depth of around 2,900 kilometers, a great change takes place and the mantle gives way to the core. Some seismic waves cannot pass through the core and others are bent by it. From this and other evidence, geologists conclude that the outer core is probably liquid, with a solid center. It is almost certainly made of iron, mixed with smaller amounts of other elements such as nickel. The conditions in the Earths core make it a fa