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
2024-08-15
53
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] 【B2】
选项
答案
B
解析
上文介绍沙子是一种常见的现象。下文开始更进一层介绍沙子。F句可以起到承上启下的作用。
转载请注明原文地址:https://tihaiku.com/zcyy/3721332.html
相关试题推荐
Sand:aschildrenweplayonitandasadultswerelaxonit.Itissomethin
Sand:aschildrenweplayonitandasadultswerelaxonit.Itissomethin
Underwhatagecan’tchildrenshootadvertisement?[br][originaltext]16.Chil
Underwhatagecan’tchildrenshootadvertisement?[br][originaltext]16.Chil
Underwhatagecan’tchildrenshootadvertisement?[originaltext]16.Childrenw
Ithinkbeingaloneisneverreallyabadthing,______you’vegotsomethingposi
Tina’schildren,______alllivenearby,organizedabigpartyforhereightieth
Sorry,butsomethingimportanthas______andI’11havetoringyouback.A、comeo
WhyisChildren’sSkiingDaytobeheld?[br][originaltext]Inconjunctionwith
WhyisChildren’sSkiingDaytobeheld?[br][originaltext]Inconjunctionwith
随机试题
InrecentyearsAmericansocietyhasbecomeincreasinglydependentonitsuni
CardinalMezzofantiofBolognawasasecularsaint.Thoughheneverperforme
TheCongresshasthepowertoimpeachthePresidentoftheUnitedStateswhenhe
Lessthan60%ofstudentsnowenteringfour-yearAmericancollegesarelikel
证明消费者最优决策的对偶性
简述需要学说在护理实践中应用的意义。
下列各项中,不属卫生法基本原则的是( )。A.卫生保护原则 B.预防为主原则
A.心经 B.肺经 C.肝经 D.肾经 E.脾经黄芩、桑白皮主归
A.急性膀胱炎 B.急性肾盂肾炎 C.泌尿系结核 D.膀胱肿瘤 E.膀胱
与金黄色葡萄球菌毒力有关的因素A.形成血浆凝固酶的能力 B.特异性细胞糖类的存
最新回复
(
0
)