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
Northern lights is the name of a light phenomenon often seen in the northern regions. The lights have been around since Earth fo
Northern lights is the name of a light phenomenon often seen in the northern regions. The lights have been around since Earth fo
admin
2021-10-20
149
问题
Northern lights is the name of a light phenomenon often seen in the northern regions. The lights have been around since Earth formed an atmosphere—the dinosaurs saw it, early humans saw it and our descendants will see it. The scientific name for the phenomenon is "Aurora Borealis", aurora for short.
An aurora is a sporadic, generally faint, atmospheric phenomenon usually seen in the night sky from locations at high latitudes. More commonly known as the "northern lights," it may first appear as a faint, milky glow low in the north, too dim for the human eye to detect any color but bright enough to silhouette clouds near the horizon. It may develop into steady greenish arcs or form glaring, swirling curtains of yellow-green light. During the most dramatic displays visible from regions at middle latitudes, such as central Europe and the United States, a crimson glow fills much of the sky. It was this form that inspired European scientists of the 1600s to call the phenomenon aurora borealis, literally "northern dawn," but it also occurs at high southern latitudes, where it is formally called aurora australis, "southern dawn." The same processes are at work in both hemispheres—not just on Earth, but on other planets as well—and today, scientists simply refer to this phenomenon as an aurora. The ghostly forms of an aurora include quiescent patches, veils, and arcs, and rapidly moving rays and curtains.
Many historical accounts of the northern lights from areas far south of its usual location exist. An early Chinese record describes it as a "red cloud spreading all over the sky." The Roman philosopher Seneca wrote that an aurora in A.D. 37 tricked the emperor into sending troops to aid what he thought was the burning seaport of Ostia, "when the glowing of the sky lasted through a great part of the night, shining dimly like a vast and smoking fire." In 1583, similar "fires in the air" mobilized thousands of French pilgrims, who prayed to avert the wrath of God. On September 15, 1839, an intense aurora dispatched firefighters throughout London.
What causes the showers of charged particles that create the northern lights? Ultimately, the source lies in the solar wind, a fast-moving stream of particles constantly flowing from the Sun that carries the Sun’s magnetic field out into space. The solar wind, typically moving at 250 miles (400 kilometers) per second, flows past Earth’s magnetic field and molds it into an elongated bubble or cavity, compressing its sunward side and stretching its night side far beyond the Moon’s orbit. Under certain conditions, the solar wind’s magnetic field can merge with Earth’s, creating electrical currents that drive protons and electrons into the polar atmosphere. Powerful events occurring on the Sun can drive enormous changes in the solar wind, increasing both its speed and density and enhancing its effect on Earth.
It has been recorded that once in France, the northern lights were believed to be _______.
选项
A、a fire set by the enemy troops
B、punishment to humans by God
C、crimes which would enrage God
D、an indication of the doomsday
答案
B
解析
第3段倒数第2句中的the wrath of God常表示“上帝的怒火”,wrath通常暗示上帝因为愤怒而要惩罚世人,由此可见,本题应选B。本题最具干扰性的是D,doomsday是“世界末日”的意思,从原文的wrath可以知道上帝将要惩罚世人,但以什么方式惩罚却是不明确的,D说得过于绝对了。
转载请注明原文地址:https://kaotiyun.com/show/l5tK777K
0
专业英语四级
相关试题推荐
Weconsider_______thethiefstolealltheunderwearinthehouseinsteadofvaluablethings.
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofraysfromthesunandotherstars.Theatmosphe
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofraysfromthesunandotherstars.Theatmosphe
Itcanbetemptingtomakeahastydecisionwhenakilleropportunitycomesalongorthethoughtofspendinganotherdayonthe
Itcanbetemptingtomakeahastydecisionwhenakilleropportunitycomesalongorthethoughtofspendinganotherdayonthe
In1972,acenturyafterthefirstnationalparkintheUnitedStateswasestablishedatYellowstone,legislationwaspassedto
A.appearanceB.appropriateC.attractiveD.complexE.concernF.coordinateG.decoratedH.entriesI.
—Willyougohometomorrowevening?—No,Iamgoingtoalecture,oratleast,Iamplanning______.
PeoplethroughoutthehistoryhavesoughtwaystoalterconsciousnesaA【C1】_____exampleisthesweatlodgeritualoftheSioux
PeoplethroughoutthehistoryhavesoughtwaystoalterconsciousnesaA【C1】_____exampleisthesweatlodgeritualoftheSioux
随机试题
女,65岁。既往乙型肝炎病史30余年,今晨突发呕血,色鲜红,量约为1500ml,急至医院就诊,查体:BP80/50mmHg,P110次/分,面色苍白,四肢末梢凉,脾于肋下缘5cm,触及移动浊音(+),腹壁可见静脉曲张,至医院后患者又呕血一次,量约300
丘脑病变时的临床表现不包括
一谷物的赖氨酸评分为0.42,苏氨酸0.70,蛋氨酸1.04,缬氨酸0.96,色氨酸1.10。该谷物的氨基酸分是
下列反射仅在新生儿出生时存在,以后逐渐消失的是
强夯置换法适用于处理高饱和度的粉土与软塑、流塑的软黏土地基,处理深度不宜大于()m。
原文横线处关于什么是计算机病毒的表述正确的一项是( )。对“据说制造电脑病毒的主要有五种人”的理解,正确的一项是( )。
局麻过程中,为了预防医源性感染,以下措施中正确的有()。
在查询设计器环境中,"查询"菜单下的"查询去向"不包括( )。
A、Becausesomeofthemarenotusedtosomekindsofalcohol.B、Becausemostofthemdrinkfewertimesthanpeopleofothercont
A、Goandreadundertheoaktreewiththeman.B、Goandwritethereportwiththeman.C、Stayathomeandfinishwritingherrep
最新回复
(
0
)