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
If the salinity (含盐量) ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of the
If the salinity (含盐量) ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of the
admin
2010-08-04
60
问题
If the salinity (含盐量) ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation--conversion of liquid water to water vapor. In this manner, the salinity is increased, since the salts stay behind. If this is carried to the extreme, of course, white crystals of salt would be left behind.
The opposite of evaporation is precipitation (降水), such as rain, by which water is added to the ocean. Here the ocean is being diluted (稀释) so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff (形成地表水部分的降雨).
Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.
A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly-formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.
In the Weddell Sea, off Antarctica, the densest water in the oceans is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portions of the oceans of the world.
The best title of the passage can be _________.
选项
A、Typical Oceans and Their Respective Features
B、The Causes of the Changes in Salinity of Ocean Water
C、Different Oceans Have Different Salinity
D、The Precipitation and Evaporation of Oceans
答案
B
解析
本文第3句是全文的主题句,告诉读者三种致使海洋盐分变化的原因,并逐一介绍这三种原因,选项 B比较全面地归纳了本文的主题。
转载请注明原文地址:https://kaotiyun.com/show/DAA7777K
0
大学英语四级
相关试题推荐
A、Motherandfather.B、Motherandson.C、Teacherandstudent.D、Twostudents.A
Thegreatestrecentsocialchangeshavebeeninthelivesofwomen.Duringthetwentiethcenturytherehasbeenaremarkablesho
______(尽管为语言学习的自的而改编的阅读材料相当广泛)thereisyetnocomprehensivesystematicprogramforthereadingskills.
A、Placestoplaytennis.B、Awaytorelievepain.C、Commonsportsinjuries.D、Atopicforaresearchpaper.B
A、Itisatravelagency.B、Itisamarketingcompany.C、Itisanadvertisingagency.D、Itisanaerospaceconsultinggroup.D
A、Therearemoresmokersamongwomenwithlowincomes.B、Womenwithhigherincomesandhighereducationdonottendtosmoke.C、
A、Halfanhour.B、Lessthananhour.C、Onehour.D、Twohours.B细节题。问题是女士考试考完用的实际时间。从W的回答中听出她花费不到一半的时间。
A、Toselltheiroldcar.B、Tokeeptheiroldcar.C、Toleaveitinthegaragetoberepaired.D、Togetitrepaired.A
A、Hedoesn’thaveacomputer.B、Hecan’tunderstandtheinstructions.C、Heneedstotakehiscomputertoberepaired.D、Hehasa
A、Heshouldn’tputonhisshoes.B、Heshouldgotoamovie.C、Heoughttoworkonhispaper.D、Heshouldn’twriteaboutthemovi
随机试题
我国《专利法》规定,实用新型专利申请人应当向国务院专利行政部门提交的申请文件有()
细菌L型是指
下列情况除哪种情况外都能引起多尿
初始土地登记准备工作中应加强对基础干部、基层登记工作人员和用地量较大的单位和个人的培训,培训的内容包括()。
以下关于资本积累率指标说法正确的有( )。
甲公司为劳务派遣单位。2017年3月10日,钱某被甲公司招用,同日被派遣至乙公司工作6个月。期间钱某被乙公司派遣至丙公司(乙公司的子公司)工作15天,2017年9月钱某派遣期满,甲公司未为其安排工作。要求:根据上述资料,不考虑其他因素,分析回答
甲与商家乙订立了某品牌的电冰箱试用买卖合同,双方并没有对试用期间作出明确约定,下列关于该合同的说法正确的是()。
一个重公德、讲卫生、有礼貌的文明社会或文明城市,并不是靠“五讲四美”的群众运动或制订诸如吐痰罚款等措施所能建立起来的。倘使每个公民没有发自内心的需要,认为讲公德和自己的利益休戚相关,倘使没有这种公民意识的自觉,那么,无论依靠多么严厉的强制手段也是无济于事的
通过搜集和分析某人过去和现在有关方面的资料,以推知其行为原因的方法是()。
社会主义初级阶段实行按生产要素分配的依据是
最新回复
(
0
)