首页
登录
职称英语
Sand: as children we play on it and as adults we relax on it. It is somethin
Sand: as children we play on it and as adults we relax on it. It is somethin
游客
2023-10-17
13
管理
问题
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.
【B1】______And it is a major element in manufactured products too—concrete is largely sand, while glass is made of little else.
【B2】______ 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.
【B3】______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.
【B4】______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.
【B5】______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.
Questions 61—65
Complete the passage with the following sentences. There are two extra sentences that you do not need to use.
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 an 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. [br] 【B4】
选项
答案
G
解析
本段介绍的是沙子的颜色。G句可以作为总起句。
转载请注明原文地址:https://tihaiku.com/zcyy/3104716.html
相关试题推荐
Goodleaderstellpeoplewhytheyaredoingsomething,______,toexplainwhatt
—Doyouwanttoeatouttonightorshallwecooksomething?—______Ican’taffor
Michelangelo,Napoleon,ThomasEdison,andMadonnaallhavesomethingincom
Thisbarchartshowshowmanytimesaclassofchildrenhitatargetwithaset
Whereisthemanrecommendedtoread?[br][originaltext]M:Somethingthatanno
Whereisthemanrecommendedtoread?[br][originaltext]M:Somethingthatanno
Whereisthemanrecommendedtoread?[originaltext]M:Somethingthatannoysme
HowHealthyAreYou?Goodhealthisnotsomethingyo
HowHealthyAreYou?Goodhealthisnotsomethingyo
HowHealthyAreYou?Goodhealthisnotsomethingyo
随机试题
Smokersinthe"landofthefree"arefindingthemselvesincreasinglylessf
[originaltext]M:Goodafternoon,isthereanythingIcanhelpyouwith?W:Yes.
足月新生儿,因胎心每分钟>160次而以产钳助产,第二产程延长,Apgar评分3分
在上述咳嗽表现中,肾水亏多表现为( )。A.咳声低微 B.咳声重浊 C.夜
对放线菌叙述正确的是A.革兰阴性菌B.抗酸性为阴性C.触酶试验阳性D.可产生吲哚
试述幼儿教育的任务。
某地级市位于山区和沿江平原的结合部,域内“七山二水一分田”,人地矛盾突出,境内交
证券公司从事期货中间介绍业务,应当协助维护期货交易系统的稳定运行,保证期货交易数
流动式起重机的基本参数,指作为选择吊车和制订吊装技术方案的重要依据的吊车性能数据
女,40岁。双侧乳房月经前明显胀痛,月经后可自行缓解。乳腺超声提示双侧乳腺多发小
最新回复
(
0
)