首页
登录
职称英语
In this section, you will hear a short passage. For questions 21—30, complete th
In this section, you will hear a short passage. For questions 21—30, complete th
游客
2023-10-13
35
管理
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. [br] 【D3】
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
water vapor
解析
(录音中探究了海水是如何一开始变成的,提到了5亿年前,水蒸气和其他气体从地球内部散发出来,便逐渐形成了大气和云层,对应空格得知应填写water vapor。)
转载请注明原文地址:https://tihaiku.com/zcyy/3093303.html
相关试题推荐
Thereisonepassageinthissectionwith10questions.Readthepassagequi
Thereisonepassageinthissectionwith10questions.Readthepassagequi
Thereisonepassageinthissectionwith10questions.Readthepassagequi
Thereisonepassageinthissectionwith10questions.Readthepassagequi
Thereisonepassageinthissectionwith10questions.Readthepassagequi
In,thissection,thereisonepassagefollowedbyasummary.Readthepassa
In,thissection,thereisonepassagefollowedbyasummary.Readthepassa
In,thissection,thereisonepassagefollowedbyasummary.Readthepassa
Inthissection,youwillhearashortpassage.Thereare10missingwordso
Inthissection,youwillhearashortpassage.Thereare10missingwordso
随机试题
AstheworldexcitedlygreetedSnuppy,thefirstcloned(克隆)dog,commentators
Theproducersofinstantcoffeefoundtheirproductstronglyresistedinthe
[originaltext]Sociologistsworkinginwesterncountrieshavefoundthatal
单层面CT扫描,控制层厚的部件是A.X线管窗口大小 B.X线管滤过板厚度 C
D图形中的四个数的规律为左边数字与右边数字的商等于上边数字与下边数字的差。因此括号内应填入的数为(11-5)X6=36。
证券公司净资本或者其他风险控制指标不符合规定标准的,派出机构应当责令公司限期改正
以下哪项是六一散的功用A.清暑益气 B.清解暑热 C.清心解暑 D.
新韦伯主义城市理论主要包括()A.雷克斯和墨尔的住房阶级理论 B.帕尔的
鉴于小型股票的流动性偏低,因此,从长期来看,小型资本股票的回报率()大型资本
A.参苏丸 B.荆防颗粒 C.正柴胡饮颗粒 D.双黄连口服液 E.桑菊感
最新回复
(
0
)