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
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
admin
2017-11-17
25
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.
Coastal regions are mentioned as cases where _____.
选项
A、sea water is less salty because fresh water joins in
B、rivers carry industrial exhaust into sea
C、sea ice tends to melt more quickly than in the center of oceans
D、heavy water sinks to the deeper portions of the oceans
答案
A
解析
推理判断题。coastal regions字眼在文章中提到两遍,分别在第2段第3句及第3段最后一句。只要能够迅速查找到任何一处均可做出正确判断为A。B和C无原文支持;D张冠李戴,原文提及D内容涉及的是Weddell Sea,而非coastal regions。
转载请注明原文地址:https://kaotiyun.com/show/jLa7777K
0
大学英语四级
相关试题推荐
Whenolderpeoplecannolongerremembernamesatacocktailparty,theytendtothinkthattheirbrainpowerisdeclining.Buta
SchoolsoutsidecitiesA)Withitssandybeaches,charmingruinsandoccasionallybluewaters,theIsleofWightisaperfectspo
A、Shecanmakealotoffriends.B、Shecanlearnmentaldiscipline.C、Shecangetmorefamiliarwiththeman.D、Shecanlosewei
BigisBackA)Corporategiantswereonthedefensivefordecades.Nowtheyhavetheadvantageagain.In1996,inoneofhis
Anewstudysuggeststhatthemoreteenagerswatchtelevision,themorelikelytheyaretodevelopdepressionasyoungadults.B
TheUSCongressA)TheUScongressisthelegislativebranchofthefederalgovernment.Itisabicameral(两院制的)law-making
Inthe1960s,medicalresearchersThomasHolmesandRichardRahedevelopedachecklistofstressfulevents.Theyappreciatedthe
A、Childrenweremorelikelytodrinktoomuchsoda.B、Attentionproblemshadnothingtodowithageandsex.C、Drinkingsodamig
A、Somenewlydiscoveredscenicspot.B、BigchangesintheAmazonvalley.C、Anewrailwayunderconstruction.D、ThebeautifulAma
Infact,evenwithouthumans,theEarth’sclimatechanges.Someclimatechangeis【C1】______.But,asgreenhousegasesareadded
随机试题
简述产业购买者的行为类型有哪些。
A.肺脓肿B.肺褐色硬化C.肺结核D.肺肉质变小叶性肺炎的常见并发症是
关于减刑、假释案件的审理,下列选项正确的是:()
下列短期负债筹资方式中,属于商业信用形式的有()。
自然规律必须通过人的理性思维来把握,因此人的理性能为自然界立法。()
在社会主义市场经济条件下,价格应当由()形成。
Mother:Tom,it’s7:30,you’regoingtobelateforschool.Tom:Ifeellikeanotherfiveminutes’sleep.Mother:______Getdress
使用白盒测试方法时,设计测试用例应根据()。
Computersmayonedayturnnightintoday-withgoodold,naturalsunlight.Giantcomputer-controlledmirrors,thousandsoff
Educationistheprocessoflearningandknowing,whichisnotrestrictedtoourschooltext-books.Itisaholisticprocessan
最新回复
(
0
)