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
12
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] 【B1】
选项
答案
B
解析
空缺处之前说沙子不仅覆盖海滩,而且还覆盖大洋底部、沙漠和高山。B项表述可以对此加以概括总结。
转载请注明原文地址:https://tihaiku.com/zcyy/3104713.html
相关试题推荐
—Doyouwanttoeatouttonightorshallwecooksomething?—______Ican’taffor
Michelangelo,Napoleon,ThomasEdison,andMadonnaallhavesomethingincom
Michelangelo,Napoleon,ThomasEdison,andMadonnaallhavesomethingincom
Michelangelo,Napoleon,ThomasEdison,andMadonnaallhavesomethingincom
Thisbarchartshowshowmanytimesaclassofchildrenhitatargetwithaset
Whereisthemanrecommendedtoread?[br][originaltext]M:Somethingthatanno
Whereisthemanrecommendedtoread?[br][originaltext]M:Somethingthatanno
Whereisthemanrecommendedtoread?[br][originaltext]M:Somethingthatanno
HowHealthyAreYou?Goodhealthisnotsomethingyo
HowHealthyAreYou?Goodhealthisnotsomethingyo
随机试题
[originaltext]Aresomepeoplebornclever,andothersbornstupid?Oristh
[originaltext]TomHanks,JuliaRoberts,ERandFriendsweresomeofthebig
Thestandardofficialretirementagetoqualifyforapublicpensioninmost
古籍保护应加强()措施,杜绝灾害发生。a防蛀b防水c防火d防盗A.ab
患儿女,1岁。来医院查体,体重8.5kg,身高75cm,头围46cm,前囟未闭合
李某去世后,社区护士定期与其夫人联系,关心其生活并帮助建立生活信心。此工作属于(
最早提出了圆周率计算方法的数学家是祖冲之。()
一级建造师矿业工程的建造内容包括()。A.立井 B.矿区公路和隧道
铲运车通常适合施工的条件是()。A.干燥的粉砂土 B.潮湿的黏土 C.沼泽
根据《水法》,堤防工程护堤地属于()。A.工程效益范围 B.工程管理范围
最新回复
(
0
)