首页
登录
职称英语
Sand covers not just sea-shores, but also ocean beds, deserts and mountains.
Sand covers not just sea-shores, but also ocean beds, deserts and mountains.
游客
2023-07-17
13
管理
问题
Sand covers not just sea-shores, but also ocean beds, deserts and mountains. It is one of the most common substances on earth. And it is a【B1】______element in man-made materials too—【B2】______is largely sand, while glass is made by melting sand and some other elements.
What exactly is sand? In fact, according to the most generally【B3】______scheme of measurement, devised by the Massachusetts Institute of Technology, grains qualify as sand if their【B4】______is greater than 0.06 of a millimeter and less than 0.6 of a millimeter.
Depending on its age and【B5】______, particular sand can consist of tiny pebbles or porous granules. Its grains may have the shape of【B6】______or spirals, their edges jagged or smooth. They have come from the【B7】______of rocks, or from the skeletons of marine organisms, which accumulate on the【B8】______of the oceans, or even from volcanic eruptions.
Usually, the older the granule,【B9】______The fine, white beaches of northern Scotland, for instance, are recycled from sandstone several hundred million years old.【B10】______.
Sand is an irreplaceable industrial factor, which has many uses; but it bas one vital function you might never even notice. Sand cushions our land from the sea’s impact,【B11】______. [br] 【B1】
Sand covers not just sea-shores, but also ocean beds, deserts and mountains. It is one of the most common substances on earth. And it is a (26) major element in man-made materials too—(27) concrete is largely sand, while glass is made by melting sand and some other elements.
What exactly is sand? In fact, according to the most generally (28) accented scheme of measurement, devised by the Massachusetts Institute of Technology, grains qualify as sand if their (29) diameter is greater than 0.06 of a millimeter and less than 0.6 of a millimeter.
Depending on its age and (30) origin, particular sand can consist of tiny pebbles or porous granules. Its grains may have the shape of (31) stars or spirals, their edges jagged or smooth; They have come from the (32) erosion of rocks, or from the skeletons of marine organisms, which accumulate on the (33) bottom of the oceans, or even from volcanic eruptions.
Usually, the older the granule, (34) the finer they are and the smoother their edges. The fine, white beaches of northern Scotland, for instance, are recycled from sandstone several hundred million years old. (35) Perhaps they will be stone once more. in another few hundred million years.
Sand is an irreplaceable industrial factor, which has many uses; but it has one vital function you might never even notice. Sand cushions our land from the sea’s impact, (36) and geologists say it often does a better lob of protecting, our shores than the most advanced coastal technology.
选项
答案
major
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2845388.html
相关试题推荐
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
Sandcoversnotjustsea-shores,butalsooceanbeds,desertsandmountains.
随机试题
[originaltext]M:Morning,Brenda.W:Goodmorning,MrBrowning.M:Er,didyou,
设(X,Y)服从二维正态分布,则下列说法不正确的是().A.X,Y一定相互独立
下列有关医院基地出入口布置的叙述,正确的是:()A.出入口有足够宽度时可以设
已知某国国际收支平衡表中,经常项目差额160亿美元,资本和金融项目差额为-100
研究能力是大学教师的基本能力。
写字楼项目以( )为主导的销售策略适用于同期市场可能存在有力竞争对手的情况。A
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
咨询性会谈中不涉及的是()。A.神经症患者 B.心理健康者 C.精神病患者
银行会计核算中,所有者权益包括()。A.实收资本 B.资本公积 C.盈
特种设备生产单位应当具备的条件不包括( )。A.有与生产相适应的专业技术人员
最新回复
(
0
)