首页
登录
职称英语
If the salinity (含盐量) of ocean waters is analyzed, it is found to vary only
If the salinity (含盐量) of ocean waters is analyzed, it is found to vary only
游客
2023-06-25
52
管理
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 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. [br] 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
主旨大意题。本文第1段第3句是全文的主题句,告诉读者有三种原因致使海洋盐分变化,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。选项A和C中心词为oceans,不妥,选项D只提及了前面两种原因,不全面。
转载请注明原文地址:http://tihaiku.com/zcyy/2780480.html
相关试题推荐
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
[originaltext]NewYorkStateplanstoshutoffthethunderingwatersofNia
[originaltext]NewYorkStateplanstoshutoffthethunderingwatersofNia
[originaltext]NewYorkStateplanstoshutoffthethunderingwatersofNia
随机试题
Ourfeverishplanetbadlyneedsacure.Itwasprobablyalwaystoomuchtob
请求更换保险代理说明:假设你是车主,写信给保险公司的经理Anderson先生,请求更换代理。内容:1.自己是AA保险公司约5年的保险客户
金融体系主要由哪些机构构成?
建设工程施工合同分析后,应向各层次管理者( )。A.提交分析报告 B.提交合
一足部患有严重溃疡的糖尿病病人,经治疗病情未减轻,且有发生败血症的危险,此时为保
统计分类标准化应当包括( )A.制定标准 B.发布标准 C.修订标准 D.
(2013年)关于增量成本的说法,正确的有()。A.增量成本是一种前瞻性经济成本
下列交易或事项形成的其他综合收益中,以后期间可以转入损益的有()。A.以公
根据税收征收管理法律制度的规定,对于扣缴义务人未按照规定的期限向税务机关报送其全
“餐叉”畸形见于( )。A.尺骨上端骨折 B.桡骨上端骨折 C.桡骨下端骨
最新回复
(
0
)