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)of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of th
If the salinity(含盐量)of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of th
admin
2010-10-14
54
问题
If the salinity(含盐量)of 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 carded 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/5487777K
0
大学英语四级
相关试题推荐
Therearetwotypesofpeopleintheworld.Althoughtheyhaveequaldegreesofhealthandwealthandtheothercomfortsoflife
A、Itisthesameeveryyear.B、Amarkover70%willpass.C、Itisthesameforeveryexam.D、Amarkover60%willpass.B题目问这个考试
A、Theamountofrain.B、Thewinddirection.C、Theamountoffrost.D、Thetemperature.D题目问90天的天气预报什么方面比较准确。女士说男士的说法只对了一半,长期天气预报在
Withthepassageoftime,thewaveofchangealsospreadtocities.Theexpression"one’s【C1】______onmarriage"begantoappear
Scientificresearchhasrevealedthatthroughouttheanimalworld,communicationisjustasimportantasitistohumanbeings.
Musicwhichis【B1】______isindividualandpersonal.Thatistosay,itcanbe【B2】______asbelongingtoa【B3】______composer.Ith
A、Effectivecommunicationisessentialtosolvethedog’sbehaviorproblems.B、Effectivecommunicationisagoodwaytoteachth
Soon___________(有一个新的发展)thathadfar-reachingeffects.
A、Thedoorneedsrepairing.B、Hehadlostallhiskeys.C、Hecouldn’topenthedoor.D、Hewantedthewomantohelphim.C信息明示题。
A、Youcansleepinit.B、it’ssaferthantrains.C、It’sfastandcomfortable.D、Youcanseemoreofthecountry.D细节题。短文第二句就提到Th
随机试题
成人高血压的诊断标准为【】
“国防戏剧”
桥梁荷载试验挠度观测点一般布置在桥轴线位置。()
属于桥梁的五“小部件”的是( )。
(一)基本情况:市区内某股份有限公司,系增值税一般纳税人,并实行防伪税控系统管理,主要从事高档防盗门的生产和销售业务,会计核算健全,生产经营良好。税务师于2015年4月15日受托审核该公司2014年全年的纳税情况。(二)审核资料:
甲木制品厂为增值税一般纳税人,主要从事实木地板生产销售业务,2019年2月发生下列业务:(1)外购一批实木素板,取得增值税专用发票注明金额120万元;另支付运费2万元,取得增值税普通发票。(2)将上述外购已税素板的30%连续生产A型实木
只有法才规定人们的权利和义务,其他社会规范不规定。()
一、注意事项1.申论考试与传统的作文考试不同。是分析驾驭材料的能力与表达能力并重的考试。2.作答参考时限:阅读资料40分钟。作答110分钟。3.仔细阅读给定的资料。按照后面提出的“作答要求”依次作答在答题纸指定位置。4.答题时请认准题号。避免答错位
下列情况可以认定为合伙人的是()
A、Theyareconfidentinitseconomicsecurity.B、Theythinkmoreaggressivemeasuresareneeded.C、Theyaredissatisfiedwithit
最新回复
(
0
)