首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Ocean water plays an indispensable role in supporting life. The great ocean basins hold about 300 million cubic miles of water.
Ocean water plays an indispensable role in supporting life. The great ocean basins hold about 300 million cubic miles of water.
admin
2010-12-06
122
问题
Ocean water plays an indispensable role in supporting life. The great ocean basins hold about 300 million cubic miles of water. From this vast amount; about 80,000 cubic miles of water are sucking into the atmosphere each year by evaporation and returned by precipitation and drainage to the ocean. More than 24,000 cubic miles of rain descend annually upon the continents. This vast amount is required to replenish the lakes and streams, springs and water tables on which all flora and fauna are dependent. Thus, the hydrosphere permits organism existence.
The hydrosphere has strange characteristics because water has properties unlike those of any other liquid. One anomaly is that water upon freezing expands by about 9 percent, whereas most liquids contract on cooling. For this reason, ice floats on water bodies instead of sinking to the bottom. If the ice sank, the hydrosphere would soon be frozen solidly, except for a thin layer of surface melt water during the summer season. Thus, all aquatic life would be destroyed and the interchange of warm and cold currents, which moderates climate, would be notably absent.
Another outstanding characteristic of water is that it has a heat capacity which is the highest of all liquids and solids except ammonia. This characteristic enables the oceans to absorb ard store vast quantities of heat, thereby often preventing climatic extremes. In addition, water dissolves more substances than any other liquid. It is this characteristic which helps make oceans a great storehouse for minerals which have been washed down from the continents. In several areas of the world these minerals are being commercially exploited. Solar evaporation of salt is widely practiced, potash is extracted from the Dead Sea, and Magnesium is produced from seawater along the American Gulf Coast.
From this passage, we may conclude that ______.
选项
A、ocean and land masses are equal
B、ocean masses are smaller than land masses
C、it is difficuit to get fresh water from the ocean
D、none of the above is correct
答案
C
解析
本文并未对ocean mass与land mass进行比较,因此选项A、B不正确。最后—段讲到oceans a great storehouse for minerals which have been washed down from the continents(大海成厂一个储存从大陆上冲刷下来的诸多矿物质的仓库),由此可以推断从海水中提取淡水可能会比较困难。所以答案为选项C。
转载请注明原文地址:https://kaotiyun.com/show/rpIO777K
0
考博英语
相关试题推荐
HowtoapproachListeningTestPartTwo•ThispartoftheListeningTesttestsyourunderstandingofnumbers,namesandspell
HowtoapproachListeningTestPartTwo•ThispartoftheListeningTesttestsyourunderstandingofnumbers,namesandspell
Howmanypeoplearecomingfordinner?Whichofthepiechartsiscorrect?
Everynewmachinecontains
Youwillheartwotelephoneconversations.Writedownonewordornumberinthespacesontheformsbelow.Message1Questions1
ElizabethEltingNameofHerBusiness:【B1】______RevenuesoftheBusiness:【B2】______millionDegree:【B3】Bachelorof______Co-f
Readthismessagefromyoursecretary.TelephoneMessageMrSmithcalled--sampleofshirtsnotar
Yourcompanyhasdecidedtomakeachangetoitsworkinghours.Writeanemailtostaffinyourdepartment:describingthe
ThisWorkingLifeByMaureenDowdIntheworldofbusiness,itisnotalwayseasyforwomentodothe(29)thingsasmen.
消除贫困是当代世界的重大课题。发达国家应该从提供资金、减免债务、转让技术、平等贸易等方面,支持和帮助发展中国家振兴经济,提高人民生活水平,这也符合发达国家的长远利益,各国经济共同增长和普遍繁荣,是人类努力的方向。
随机试题
下列属于组织的组织环境划分形式的是()
吉列公司生产的一种洗发香波,在美国称为“Sikience”,在法国称为“Soyance”,在日本称为“Silience”,这些称谓属于()
《命运交响曲》是______的音乐作品。()
A.胃镜检查B.钡餐造影C.腹部CTD.腹部B超E.胃液分析了解溃疡病患者胃酸分泌情况依据
甲公司2017年1月1日发行三年期可转换公司债券,实际发行价款200000万元,其中负债成分的公允价值为180000万元。假定发行债券时另支付发行费用600万元。不考虑其他因素,甲公司发行债券时应确认的“其他权益工具”科目的金额为()万元。
一般资料:求助者,男性,15岁,初中三年级学生。案例介绍:求助者很喜欢班里一位漂亮女同学,经常有想拥抱她的冲动。三个多月前梦到和她拥抱。此后总想着梦中的事,上课时心神不宁,不能安心学习,成绩下降。母亲觉察后严厉地批评了他,让他不要胡思乱想。这使他
4,13,61,202,124,()
秦朝时全国共36郡,一郡之内又分若干县,县以下是乡、里基层行政机构。下列有关当时基层行政机构官职的说法不正确的是()。
下列叙述中正确的是
有表示公司和职员及工作的三张表,职员可在多家公司兼职。其中公司C(公司号,公司名,地址,注册资本,法人代表,员工数),职员S(职员号,姓名,性别,年龄,学历),工作W(公司号,职员号,工资),则表W的键(码)为
最新回复
(
0
)