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
专升本
If half of the water were to be drained from the Pacific Ocean, a curious kind of submarine mountain called a guyot(海底平顶山)would
If half of the water were to be drained from the Pacific Ocean, a curious kind of submarine mountain called a guyot(海底平顶山)would
admin
2021-11-04
18
问题
If half of the water were to be drained from the Pacific Ocean, a curious kind of submarine mountain called a guyot(海底平顶山)would be exposed. Guyots are strange formations that resemble mushroom stalks with flat tops. More than six hundred and fifty of these volcanic stalks have been discovered in the Pacific Ocean, and a few others have been discovered in the Atlantic sea plains .
It is easy to suppose that the guyots were formed by underwater lava spouts that piled up volcanic debris(残骸)over the years, but just how they acquired their curiously flat tops remains a mystery.
Shallow-water fossils found embedded(植入)in the tops of some guyots suggest that at one time the flat tops were much nearer the ocean’ s surface, but beyond this there is little that scientists can say.
One attempt to account for the flat tops suggests that the ocean levels were once much lower than they are today; thus wave action might have smoothed away the original peaks.
Another theory holds that the guyots have probably always flat tops and that their weight has pushed them slightly toward the ocean floor, causing them to slowly submerge .
But these are only theories—the guyots are still a geophysical puzzle.
We can conclude from this passage that______.
选项
A、there are guyots in every ocean of the world
B、guyots are produced by violent volcanic action
C、the mystery of the guyots will soon be solved
D、the guyots’ flat tops will remain a mystery for some time
答案
D
解析
文章中反复出现but just how theyacquired their curiously flat tops remains amystery,but beyond this there is little that scientistscan say.But these are only theories--the guyotsare still a geophysical puzzle.故选D。
转载请注明原文地址:https://kaotiyun.com/show/cyZC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Whatenablessomepeopletogetbigcreativebreakthroughswhileothersonlygetsmallandnon-creativebreakdowns,blamingthem
ThenorthernpartsoftheUnitedStatesgetverycoldinthewinter.Itsnowsagreatdealandthetemperatureoftengoes【C1】__
Itiscustomaryforadultstoforgethowhardanddullandlongschoolis.Thelearningbymemoryofallthebasicthingsonemu
Animalshavedifferentwaysofprotectingthemselvesagainstwintertimeweather.Someanimalsgrowheavycoatsoffurorfeather
ThefirstEuropeanstockexchangewasestablishedinAntwerp,Belgium(比利时),in1531.TherewerenostockexchangesinEnglandun
LatelyIhavebeennoticingthegreatnumberofelectricalappliances(电器)onthemarket.Itseemstomethatthereare【C1】______n
LatelyIhavebeennoticingthegreatnumberofelectricalappliances(电器)onthemarket.Itseemstomethatthereare【C1】______n
HistorianstendtotellthesamejokewhentheyaredescribinghistoryeducationinAmerica.It’stheone【C1】______theteacher
Hewasn’taskedtotakeonthechairmanshipofthesociety,______insufficientlypopularwithallmembers.
Theonly______tothatmountain-townisanarrowanddirtyroad.
随机试题
患者咳嗽气喘,痰稀色白,形寒肢冷,舌淡苔白,脉迟,属于()(1992年第26题)
控制子痫的首选药物是
喹诺酮类药物的抗菌作用机制是
以下成分属于呋喃香豆素的是()。
葡萄糖和碱性酒石酸铜试液反应生成的红色沉淀应为
在灭火器日常管理中,对于消防重点单位应()至少巡查1次。
民俗是各国(或各民族)人民创造、享用和传承的一种生活文化。其功能是指它在社会生活与文化系统中的位置,它与其他社会文化要素之间的关系,以及它所具有的客观效用。民俗的功能十分复杂。各种不同的民俗功能既有差异性,也有同一性;一种民俗的功能既可能是单一的,也可能是
(2012年上半年上午试题29)软件开发的增量模型_______。
中新网12月18日据新华网报道,截至18日中午,陕西省紫阳县17日发生的沉船事故中遇难人数上升到8人,还有2人下落不明。17日15点40分,紫阳县向阳镇瓦房渡口发生一起机动渡船沉船事故。据初步调查,除船主1人外,船上共乘载乘客23人,均为向阳镇初级
ThemayorofCountyClubHillshelpedarresttwomenWednesdaynightsuspectedintherandomshootinga15-year-oldboyashewa
最新回复
(
0
)