首页
登录
职称英语
63. The investigation of the accident lasted for almost two years. Sand: as
63. The investigation of the accident lasted for almost two years. Sand: as
游客
2024-08-19
5
管理
问题
63. The investigation of the accident lasted for almost two years.
Sand: as children we play on it and as adults we relax on it. It is something we complain about when it gets in our eye on a windy beach, and praise when it is made into sand castles.
But we don’t often look at it. If we did, we would discover an account of a geological past and a history of sea life that goes back thousands and, in some cases, millions of years.
Sand covers not just seashores, but also ocean beds, deserts and mountains.
64.______
And it is a major element in manufactured products too—concrete is largely sand, while glass is made of little else.
65______
Well, it is larger than fine dust and smaller than shingle. In fact, according to the most generally accepted scheme of measurement, grains can be called sand if their diameter is greater than 0. 06 of a millimetre and less than 0. 6 of a millimetre.
Depending on its age and origin, a particular sand can consist of tiny stones or porous grains through which water can pass.
66 ______
They have come from the breaking down of rocks, or from the dead bodies of sea creatures, which collect on the bottom of the oceans, or even from volcanic eruptions.
67 ______
If it is a dazzling white, its grains may come from nearby coral, from crystalline quartz rocks or from gypsum, like the white sand of New Mexico. On Pacific Islands, jet black sands form from volcanic minerals. Other black beaches are magnetic and are mined for iron ore.
68______
It washes rock into streams and rivers and down to the sea, leaving behind softer materials. By the time it reaches the sea, the hardest rocks remain but everything else has been broken into tiny particles of 0. 02 millimetre diameter or less. The largest pieces fall to the bottom quickly, while smaller particles float and settle only slowly in deeper water, which is why the sandy beach on the shoreline so often turns to mud further out.
69______
If the individual fragments still have sharp edges, you can be sure they were formed fairly recently. This is the case on the island of Kamoama in Hawaii, where a beach was created after a volcanic eruption in 1990. Molten lava spilled into the sea and exploded into glassy droplets.
It seems that when the poet William Blake saw infinity in a grain of sand he was not far wrong.
70____
Sand is an irreplaceable industrial ingredient which has many uses.
Sand cushions our land from the force of the sea, and geologist say it often does a better job protecting our shores than the most advanced coastal technology.
A. These may have the shape of stars or spirals, their edges rough or smooth.
B. It is one of the most common substances on earth.
C. In addition, it has one vital function which you might never even notice.
D. Rain is all important force in the creation of beaches.
E. In the great slow cycle of the earth, sand that was once rock can turn to rock again.
F. What exactly is sand?
G. Colour is another clue to the origins of sand.
H. It can be difficult to date the sand on a beach accurately but it is possible to get a general idea of whether or not the sand is "young”or "old". [br]
选项
答案
A
解析
这一段讲沙子的组成、形状和来源。空格前面一句在介绍沙子的组成,空格后面一句介绍沙子的来源,由此可知空格处应该填沙子的形状。
转载请注明原文地址:https://tihaiku.com/zcyy/3726378.html
相关试题推荐
HowlonghasMelissabeenatravelwriter?A、Forthirteenyears.
63.Theinvestigationoftheaccidentlastedforalmosttwoyears.Sand:as
63.Theinvestigationoftheaccidentlastedforalmosttwoyears.Sand:as
63.Theinvestigationoftheaccidentlastedforalmosttwoyears.Sand:as
ThecombinedagesofFrasierandNilesis88years.ThecombinedagesofNilesa
Howmanypassengersweresavedintheaccident?[br][originaltext]AnIndonesia
Howmanypassengersweresavedintheaccident?[originaltext]AnIndonesiannavy
Televisionsenablesustoseethingshappenalmostattheexactmoment______.A、
______memostwasthattheyoungboywhohadlostbotharmsinanaccidentcoul
Almosteveryonewithorwithoutacomputerisawareofthelatesttechnologi
随机试题
[originaltext]Thetraditionaltwo-partysystemofSpanishpoliticshasbeen
[originaltext]M:Hi,Helen.Howdidyourdrivingtestgo?Didyougetyourdriv
下列关于PPP项目领域涉及的资产评估业务的说法中,正确的是()。A.PPP的意
上海是长江三角洲冲积平原的一部分,平均高度为海拔()米左右。A.5 B.4
男性,58岁,胸痛、痰中带血丝2个月余,胸部X线示右肺上叶有一块状阴影,边缘不清
初中语文《桃花源记》主要教学过程及板书设计 ??教学过程 ??(一)导入新课 ??英国詹姆斯?希尔顿在小说《消失的地平线》中“虚构”了一个叫
社会救助的内容包括()。A.对无依无靠的绝对贫困者提供的基本保障 B.
不能称做“项目”的生产活动及其成果特性的是()。A.大批量的 B.投资一次性的
干粉灭火系统采用局部应用灭火系统的保护对象,应符合()。A.当保护对象有可燃气
A公司2021年准备购入一条生产线,有关资料如下: (1)该生产线购买价值为1
最新回复
(
0
)