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
In this section, you will hear a short passage. For questions 21—30, complete the notes using no more than three words for each
In this section, you will hear a short passage. For questions 21—30, complete the notes using no more than three words for each
admin
2019-01-08
23
问题
In this section, you will hear a short passage. For questions 21—30, complete the notes using no more than three words for each blank. The passage will be read only once. Remember to write the answers on the answer sheet.
-The ocean is still salty.
-Evaporated water leaves【D1】______behind, which makes the ocean salty.
-How did oceans form?
- It is said that oceans formed at least【D2】______ago.
- Atmosphere and clouds on the Earth are gasses, such as【D3】______ escaping from the planet’s interior.
-Were oceans in the past as salty as they are today?
-Oceans were not so salty in【D4】______state.
-With【D5】______ sweeping over the planet’s【D6】______and filtering down to the hollows , materials containing ingredients of salt were picked up.
- Chlorine, came from the【D7】______and gaseous fallout of land and【D8】______volcanoes.
-The oceans’ salt content increases because of the steady flow of【D9】______and streams and the【D10】______of volcanoes and undersea vents.
【D9】
I know why the ocean is still salty: evaporated water leaves the salt behind. But how did it get salty in the first place?
According to one hypothesis, oceans formed at least 500 million year ago when water vapor and other gasses escaped from the Earth’s interior gradually formed the atmosphere and clouds surrounding the planet. As the earth cooled below the boiling point of water, rain began to fall, and kept falling for centuries. Eventually the rainfall filled the Earth’s hollows and formed oceans.
In their infant state these oceans were not nearly as salty as they are today. As the initial rains swept over the planet’s surface and filtered down to the hollows, the rushing waters picked up chemicals from erosion of the Earth’s crust. These chemicals included sodium, which is one of the main ingredients of salt. The other main ingredient, chlorine, came from the solid and gaseous fallout of land and ocean floor volcanoes. Over hundreds of millions of years, the steady flow of chemical-rich rivers and streams and the eruption of volcanoes and the undersea vents combined to increase the ocean’s salt content.
This does not mean, however, that the oceans’ saltiness is constantly increasing. Scientists believe that ocean salinity reached plateau hundreds of millions of years ago, when roughly the same amount of salt fed into the oceans was deposited as sediment on the ocean floor.
选项
答案
chemical-rich rivers
解析
(由录音原文“the steady flow of chemical-rich rivers and streams and the eruption of volcanoes and the undersea vents combined to increase the ocean’s salt content”可知,数亿年以来,富含化学物质的河川的稳定流动,以及陆地和海底火山的喷发都促成了海洋盐分的增加。所以此空填写chemical-rich rivers。)
转载请注明原文地址:https://kaotiyun.com/show/DZyK777K
本试题收录于:
A类竞赛(研究生)题库大学生英语竞赛(NECCS)分类
0
A类竞赛(研究生)
大学生英语竞赛(NECCS)
相关试题推荐
Planet"Y"orbitstheSuninsixmonths.ABisfourtimesthedistanceofCDandmoreoveritturnsoutthatplanetXtravelsat
HighDropoutRateinUSManyyoungpeopleintheUnitedStatesneverfinishhighschool.Exactlyhowmanydropoutsisanothe
ClassesinStudioeveryafternoonRoom51on【21】OnFridayscanuse【22】forprivatestudyExtracourses:Monda
ThesixteenthinternationalAIDSconferenceopenedonSundayinToronto,Canada.Morethantwenty-fourthousanddelegatesfromo
Bellshavebeenin【21】foralonglime.TheywereusedbytheChineseabout【22】andtheoldestbelleverfoundisaround7,000yea
WhenVetwasalittlegirl,herfamilyconsistedof______.
WhatdowelearnaboutBillfromthisconversation?
如果你不介意的话,我宁愿今晚在家看电视。(rather)
A、Putupadsinnewspapers.B、Asktheirstafftorecommend.C、Relyonhead-hunters.D、AdvertiseonTV.C对话中双方讨论了所需要的人才,最后男士提议在网上
IhadneverbeentoDenmarkbefore,sowhenIsetouttocatchtheferryinearlyMay,Ilittle______that,bytheendofthetr
随机试题
能与哪种疾病有关:首选哪项治疗:
足太阴脾经主治
某女,19岁。因发热伴头痛、烦躁2天,于1月28日入院。查体:BP130/80mmHg,精神差,神志清楚,全身散在密点、瘀斑,颈抵抗阳性,克氏征及Babinski征均阳性。实验室检查:腰穿脑脊液压力240mmH2O,外观混浊,WBC1200×106
行政界线采用0.5分辨率的航摄设计用图比例尺1:2.5万,成图比例尺测图为()。
轻型井点降水安装过程中,冲成井孔,拔出冲管,插入井点管后,灌填砂滤料,主要目的是()。【2010年真题】
由于控制继电器的动作十分频繁,因此必须做到每月至少检修()次。
上海东方公司是亚洲地区的玻璃套装门分销商,套装门在A地区生产然后运至上海。管理当局预计年度需求量为10000套。套装门购进单价为395元(包括运费,币种是人民币,下同)。与订购和储存这些套装门相关的资料如下:(1)去年订单共22份,总处理成本1340
清高宗弘历,其中,高宗是指()。
CBCL第三部分的行为问题每个年龄组都有一个正常上限分界值,其中按美国常模,4岁~5岁女孩正常上限分界值是()。
解决我国社会主要矛盾的根本途径是()。
最新回复
(
0
)