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
21
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.
【D4】
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
their infant
解析
(录音中给出信息,海水在初期形成的时候并非像现在这般咸(In their infant state these oceans were not nearly as salty as they are today),因此应填写their infant。)
转载请注明原文地址:https://kaotiyun.com/show/tZyK777K
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
MemoriesofaManIWon’tForget!Iwishyou’dmeetmyUncleBill.Hewasatallman—sotallthathecouldchangethebulbs
ClassesinStudioeveryafternoonRoom51on【21】OnFridayscanuse【22】forprivatestudyExtracourses:Monda
ClassesinStudioeveryafternoonRoom51on【21】OnFridayscanuse【22】forprivatestudyExtracourses:Monda
Thereisonepassageinthissectionwith10questions.ReadthepassagequicklyandanswerthequestionsontheAnswerSheet.
Thereisonepassageinthissectionwith10questions.ReadthepassagequicklyandanswerthequestionsontheAnswerSheet.
______issometimescalled"theworld’sbiggestfarm".
像针尖上的一滴水滴在大海里,我的日子滴在时间流里,没有声音,也没有痕迹。(slipaway)
In,thissection,thereisonepassagefollowedbyasummary.Readthepassagecarefullyandcompletethesummarybelowbychoos
In,thissection,thereisonepassagefollowedbyasummary.Readthepassagecarefullyandcompletethesummarybelowbychoos
Theconceptofinformationsuperhighwayhasbeenaroundformorethanadecade,butuntil1993itwasmerelyatechnologicalima
随机试题
A、Itisaboutthejellyfish.B、Itisabouttheseahorse.C、Itisaboutunfamiliarseaplants.D、Itisaboutunknownseaanimals.
中国古典美学中意境说是怎么提出来的?
A.皮质醇B.皮质酮C.醛固酮D.脱氢表雄酮肾上腺皮质束状带细胞分泌
男性,26岁。1周前无诱因发热,体温39.8℃,呈弛张热型,伴右侧胸痛。自服退热药等热度不退,但胸痛改善。住院检查拟诊右侧渗出性胸膜炎、结核性可能。结核病应用激素的方法应选择
根据《一般工业固体废物贮存、处置场污染控制标准》,一般性工业固体废物贮存、处置场分为()。
根据财务杠杆原理,使企业价值增加的方法有( )。
台湾同胞旅行证明由_____签发。
ISP分配给某公司的地址块为199.34.76.64/28,则该公司得到的地址数是()。
某县为回族自治县,依照宪法该县人大常委会主任或者副主任人选应当符合下列哪项规定()
曲线,直线x=2及x轴所围成的平面图形绕x轴旋转一周所成的旋转体的体积为______。
最新回复
(
0
)