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
8
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.
【D8】
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
ocean floor
解析
(参考上题,所以此空填写ocean floor。)
转载请注明原文地址:https://kaotiyun.com/show/xZyK777K
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
TheU.S.A.isknownasa"MeltingPot"foritsmixtureof______.
DevelopingEnvironmentalManagementStrategiesStrongandsustainableeconomicactivitydependsonhealthyenvironmentalman
ClassesinStudioeveryafternoonRoom51on【21】OnFridayscanuse【22】forprivatestudyExtracourses:Monda
YourEnglishclasshasanewteacher,MissAmberStart,fromAmerica.Afterattendingherfirstclassthestudentshavedecided
BecauseAtlascoursesstarteveryMondayoftheyear,there’sboundtobeonethatfitsinwithyouracademic,personalorprofe
Bellshavebeenin【21】foralonglime.TheywereusedbytheChineseabout【22】andtheoldestbelleverfoundisaround7,000yea
______isalsocalledthesunshinestateinAustralia.
A、Thirty-sixdollars.B、Thirty-sixpounds.C、Twenty-sixdollars.D、Twenty-sixpounds.A女士说自己支票账单核算不对,男士回答忘记告诉她自己买了一双鞋。女士问鞋价多少,男士
Onwhichdayoftheweekaretheyhavingtheconversation?
随机试题
属于国际经济法领域普遍性国际公约的有()
A.胸骨左缘第5肋间锁骨中线内搏动B.负性心尖搏动C.抬举性搏动D.剑突下搏动E.胸骨右缘第2肋间搏动粘连性心包炎的体征是
足阳明胃经在何处交于何经
施工工艺技术标准可由企业自己制定,目前国家()技术标准。
()是指贷款人根据借款人的提款申请和支付委托,将贷款资金支付给符合合同约定用途的借款人交易对象。
如何结合具体的学科教学来培养解决问题的能力?
求函数f(x,y)=x28y2-4x2y2在区域D={(x,y)|x2+4y2≤4,y≥0}上的最大值与最小值.
NowthatwearefairlysurethattherearemanyEarth-likeplanetsintheGalaxy,thetimeisripe(oralmostso)towonderwhet
BlackdeaththatdroveNewtonfromhiscollegeandintoamomentousdiscovery,【C1】______Englandin1665.Astronomicalrecords
Thenewhouseis______theoldone.
最新回复
(
0
)