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
51
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.
【D7】
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
solid
解析
(由录音原文“The other main ingredient,chlorine,came from the solid and gaseous fallout of land and ocean floor volcanoes”可知,雨水携带走的一种主要化学成分是氯,它源于陆地和海底火山喷发后的残留的固态和液态物质,所以此空填写solid。)
转载请注明原文地址:https://kaotiyun.com/show/RZyK777K
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
ClassesinStudioeveryafternoonRoom51on【21】OnFridayscanuse【22】forprivatestudyExtracourses:Monda
ClassesinStudioeveryafternoonRoom51on【21】OnFridayscanuse【22】forprivatestudyExtracourses:Monda
Thereisonepassageinthissectionwith10questions.ReadthepassagequicklyandanswerthequestionsontheAnswerSheet.
HowcanIeverconcentrateifyou______continually______mewithsillyquestions?
Ilayfastasleeponthecouch,whichwasassoftas______,anddidnotwakeuntillateinthemorning.
Whatcanwelearnfromtheconversation?
Youcannotfinishthetermpaperontimebecauseyoujoinedtheschool-organizedfieldpracticeprograminGuangzhouinthesumm
Hinduismextremistsheldprotestsbecause______.
TheAustralianfederationhasa______systemofgovernment.
Bellshavebeenin【21】foralonglime.TheywereusedbytheChineseabout【22】andtheoldestbelleverfoundisaround7,000yea
随机试题
简述社会主义的计划调节。
A.真性红细胞增多症B.骨髓纤维化C.珠蛋白生成障碍性贫血D.再生障碍性贫血E.缺铁性贫血泪滴形红细胞常见于
凡是反映品质标志单位组成的总体称为()。
根据《水工混凝土施工规范》DL/T5144—2001,混凝土拌合料出现下列()情况,应按不合格料处理。
设备安装标高测量时,测点的绝对标高是指测点相对于()的高程。
A公司2008年财务报表主要数据如下表所示:假设A公司资产均为经营性资产,流动负债为自发性无息负债,长期负债为有息负债,不变的销售净利率可以涵盖新增债务增加利息。A公司2009年的增长策略有两种选择:(1)高速增长:销售增长率为20%。为了筹集高速增
A、 B、 C、 C
Afterthebirthofmysecondchild,Igotajobatarestaurant.Havingworkedwithanexperienced【C1】______forafewdays,Iwa
Formilesaround,theneighborhoodswereemptyandsilent.Storesweredark,schoolsclosed,sidewalksempty.Atcorners,thest
A、Bydifferentgesture.B、Bydifferentvoice.C、Bydifferentcolor.D、Bydifferentcostume.C对话中女士提到Theypainttheirfacesindi
最新回复
(
0
)