首页
登录
职称英语
As viewed from space, the Earth’s distinguishing characteristics are its blu
As viewed from space, the Earth’s distinguishing characteristics are its blu
游客
2025-02-03
32
管理
问题
As viewed from space, the Earth’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only one in our solar system known to harbor life. Circling the Sun at an average distance of 149 million km (93 million miles), the Earth is the third planet from the Sun and the fifth largest planet in the solar system. Its rapid spin and molten nickel-iron core give rise to an extensive magnetic field which, coupled with the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Most meteors burn up in the Earth’s atmosphere before they can strike the surface. The planet’s active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it was formed. The Earth has a single natural satellite -- the Moon. [br] Approximately how much of the Earth’s atmosphere is nitrogen?
选项
A、One-fourth.
B、One-half.
C、Three-fourths.
D、All of it.
答案
C
解析
见文中第二句话:Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen,the planet is the only one in our solar system known to harbor life.地球由内含78%氮气和21%氧气的大气层包裹,是太阳系中唯一一个已知能够含有生命的星球。其中78%的氮气符合选项“地球大气中氮气含量约占四分之三”。
转载请注明原文地址:http://tihaiku.com/zcyy/3940892.html
相关试题推荐
Asviewedfromspace,theEarth’sdistinguishingcharacteristicsareitsblu
Asviewedfromspace,theEarth’sdistinguishingcharacteristicsareitsblu
Asviewedfromspace,theEarth’sdistinguishingcharacteristicsareitsblu
Asviewedfromspace,theEarth’sdistinguishingcharacteristicsareitsblu
Asviewedfromspace,theEarth’sdistinguishingcharacteristicsareitsblu
Becauseearlymanviewedillnessasdivinepunishmentandhealingaspurifica
Becauseearlymanviewedillnessasdivinepunishmentandhealingaspurifica
Becauseearlymanviewedillnessasdivinepunishmentandhealingaspurifica
Becauseearlymanviewedillnessasdivinepunishmentandhealingaspurifica
Becauseearlymanviewedillnessasdivinepunishmentandhealingaspurifica
随机试题
Thereisonepassageinthissectionwith10questions.Readthepassagequi
DearDigitalDiary—LifeloggingintheInternetAgeFromslee
关于旅行社经营核算的审核方法,下列说法错误的是()。A.单团核算是指旅行社就
农用地是指直接用于农业生产的土地,包括()。A.耕地 B.林地、草地 C
无血缘关系的同种器官移植中,急性排斥反应难以避免的主要原因是A.受者的免疫功能常
弱式有效市场检验的方法包括()。A.股票价格的时间序列分析 B.股票价格变化的
2005年某公司支付每股股息为1.80元,预计在未来的日子里该公司股票的股息按每
提高房地产经纪信息的(),一方面要对信息库进行及时的更新和维护,另一方面要提高
女性,40岁,反复右上腹部痛20余年,再发伴恶心、呕吐3天,体温39℃,B超示急
有关承诺构成要件的叙述,不正确的是()。A:承诺须由受要约人或其代理人作出
最新回复
(
0
)