托福阅读真题精选-8
【摘要】 虽然2月考试暂时取消，之后考试视情况而定，但是托福备考生不宜懈怠，下面是小编整理的托福阅读真题精选-8的内容，让我们一起来看看吧。
经与教育部考试中心研究商讨决在全国范围内取消2月所有各类托福考试，考试费将全额退还至考生个人报名账户。虽然2月考试暂时取消，之后考试视情况而定，但是托福备考生不宜懈怠，下面是小编整理的托福阅读真题精选-8的内容，让我们一起来看看吧。
Questions 21-29
Under the Earth's topsoil, at various levels, sometimes under a layer of rock, there are
deposits of clay. Look at cuts where highways have been built to see exposed clay beds; or
look at a construction site, where pockets of clay may be exposed. Rivers also reveal clay
Line along their banks, and erosion on a hillside may make clay easily accessible.
(5) What is clay made of? The Earth's surface is basically rock, and it is this rock that
gradually decomposes into clay. Rain, streams, alternating freezing and thawing, roots of
trees and plants forcing their way into cracks, earthquakes, volcanic action, and glaciers--all of these forces slowly break down the Earth's exposed rocky crust into smaller and smaller pieces that eventually become clay.
(10) Rocks are composed of elements and compounds of elements. Feldspar, which is the
most abundant mineral on the Earth's surface, is basically made up of the oxides silica and alumina combined with alkalies like potassium and some so-called impurities such as iron.
Feldspar is an essential component of granite rocks, and as such it is the basis of clay.
When it is wet, clay can be easily shaped to make a variety of useful objects, which can
(15) then be fired to varying degrees of hardness and covered with impermeable decorative coatings of glasslike material called glaze. Just as volcanic action, with its intense heat, fuses the elements in certain rocks into a glasslike rock called obsidian, so can we apply heat to earthen materials and change them into a hard, dense material. Different clays need different heat levels to fuse, and some, the low-fire clays, never become nonporous and
(20) watertight like highly fired stoneware. Each clay can stand only a certain amount of heat without losing its shape throughsagging or melting. Variations of clay composition and the temperatures at which they are fired account for the differences in texture and appearance between a china teacup and an earthenware flowerpot.
21. The author's main point in paragraph 1 is that clay deposits
(A) conceal layers of rock
(B) can be found in various places
(C) are usually small
(D) must be removed from construction sites
22. It can be inferred from the passage that clay is LEAST likely to be plentiful in which of the following areas?
(A) In desert sand dunes
(B) In forests
(C) On hillsides
(D) Near rivers
23. The word "accessible" in line 4 is closest in meaning to
(A) buried
(B) improved
(C) available
(D) workable
以上就是托福阅读真题精选-8的具体内容，我们将根据疫情防控的进展情况，动态更新并通知2020年2月后雅思考试的报名和考试安排，更多资讯关注考必过网站。