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
41
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/3106730.html
相关试题推荐
Now,children,it’stimeyou______.A、arewashinganddressingB、arewashedandd
Americaisasocietyinwhichchildrenhavewatched【D1】______18000televisi
Americaisasocietyinwhichchildrenhavewatched【D1】______18000televisi
Americaisasocietyinwhichchildrenhavewatched【D1】______18000televisi
Americaisasocietyinwhichchildrenhavewatched【D1】______18000televisi
Americaisasocietyinwhichchildrenhavewatched【D1】______18000televisi
Americaisasocietyinwhichchildrenhavewatched【D1】______18000televisi
Whatdoestheclubtrytohelpchildrenwith?[br][originaltext]W:Hello,Chil
—Imusthaveeatensomethingwrong.Ifeellike______.—Itoldyounottoeatat
Americaisasocietyinwhichchildrenhavewatched【D1】______18000televisi
随机试题
企业在经营活动中发生的下列税费,应在“税金及附加”科目中核算的是( )。A.房产
下列属于苏霍姆林斯基的教育作品的是()A.《给教师的一百条建议》 B.《教学
抗甲状腺药物的最严重副作用是A.皮疹 B.恶心、食欲下降 C.药物性肝炎
(一)导入(略) (二)整体感知,了解人物的基本情况 (学生齐读第一段)
治疗腑病多选用()A.背俞穴 B.五输穴 C.原穴 D.募穴 E.
“量杯”实验是测验定势影响迁移的一个典型例证,其策划者是()。 A.桑代克
(2018年真题)李四于2015年5月开始担任甲期货公司的首席风险官。同年9月,
对次级控制的正确表述有()。 (A)是人类通过改造自己以顺应环境的企图 (
下列人力资源预测方法中,()是一种静态的方法,不能反映未来人力资源拥有量的
锻造是金属压力加工方法之一,在其加工过程中,机械设备、工具或工件的非正常选择和使
最新回复
(
0
)