首页
登录
职称英语
Comets are now known to contain twice as many atoms of deuterium to
Comets are now known to contain twice as many atoms of deuterium to
游客
2025-02-22
29
管理
问题
Comets are now known to contain twice as many atoms of deuterium to
each atom of ordinary hydrogen found in seawater. Scientists have also
discovered that meteorites could not solely have delivered the water in the
Line ocean, for then the earth’s atmosphere would contain nearly 10 times as much
(5) xenon as it actually does, given that meteorites carry excess xenon. Hence, the
best model for the source of the oceans at the moment is a combination of water
derived from comets and water caught up in the rocky body of the earth as it
formed. This mixture satisfies both the xenon and deuterium problem, the
latter especially if the rocky material out near the earth’s present orbit
(10) collected some regularly composed local water from the solar nebula before they
accreted to form the earth. New laboratory studies have indicated that the
water vapor in the solar nebula would have had a low enough proportion of
deuterium to complement the excess deuterium found in comets. [br] The passage is chiefly concerned with
选项
A、explaining the process by which the Earth and its oceans accreted
B、reporting how recent research has arrived at a new explanation for the constitution of the Earth’s oceans
C、accounting for the chemical composition of the various ingredients of the Earth’s oceans
D、contrasting various competing hypotheses as to what the Earth’s oceans consist of
E、reporting inconsistencies with the result of new research into the composition of the Earth’s oceans
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3967502.html
相关试题推荐
AtacertainperiodinEarth’shistory,itsatmospherecontainedalmostnooxyge
Althoughitdoescontainsomepioneeringideas,onewouldhardlycharacterizeth
Themagazinearticlediscussingthegovernor’sfinancialdealingscontained(i)_
AlthoughA.S.Byatt’sstoriesareelaborateandsometimescontainsupernaturale
InJapaneseaesthetics,especiallybutnotonlyinNoh,beautycontainstheidea
Aninfluentialearlyviewheldthatecosystemscontainnichesforalimitednumb
Thedevelopmentofcontainers,possiblymadefrombarkortheskinsofanimals,
Becausethereportcontainedmuchmoreinformationthanthereviewersneededto
TheNationalArchivescontaininformationso______thatresearchershavebeenk
Astronomerswhostudyplanetformationoncebelievedthatcomets—becausethe
随机试题
arrivepastfinishedhurrymusthardworryalreadyW
WhichofthefollowingisNOTtrueaccordingtothepassage?[br]Theword"affe
肝细胞内玻璃样变性,可见A.Russell小体 B.Negri小体 C.Ma
在招标文件要求提交投标文件截止时间至少()日前,招标人可以以书面形式对已发
既能泻水逐饮,又能消肿散结的药物是A.大黄B.番泻叶C.巴豆D.甘遂E.芫花
从儿童社会心理发展的角度来看,幼儿时期的儿童需要完成()人格的培养。A:信任
国家垄断资本主义有很大发展并成为资本主义发展的一个新阶段是在 A.19世纪末
在一次人民法院的法庭审判过程中,被告人的家属在旁听席上哄闹法庭,甚至要殴打审判人
下列产品中,不属于资源税征税范围的是()。A.人造石油 B.海盐 C.天然
下列关于项目建设规模的合理性分析的表述,错误的是() A.确定建设规模时应考
最新回复
(
0
)