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
自考
The Northern Lights The sun is stormy and has its own kind of weather. It is so hot and active that even the Sun’ s gravity
The Northern Lights The sun is stormy and has its own kind of weather. It is so hot and active that even the Sun’ s gravity
admin
2013-09-17
64
问题
The Northern Lights
The sun is stormy and has its own kind of weather. It is so hot and active that even the Sun’ s gravity cannot hold its atmosphere in check! Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma(等离子体), and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun, the stronger the solar wind.
The solar wind constantly streams toward the Earth, but don’ t worry because a protective magnetic field surrounds our planet. The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles. The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth’ s magnetic field, the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.
The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons(电子)trapped in the belts to fall into the Earth’ s atmosphere at the poles. As the electrons fall into the Earth, they collide with gas molecules in the atmosphere, creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen(氮)glow red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky, they create the Northern Lights and the Southern Lights.
Watching auroras(极光)is fun and exciting, but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate, flicker, or even move like waves. During solar maximum, auroras are seen as far south as Florida, even Mexico!
Auroras often seem to be very close to the ground, but the lowest aurora is still about 100 kilometers above the ground, a distance much higher than clouds are formed or airplanes can fly. A typical aurora band can be thousands of kilometers long, a few hundred kilometers high, but only a few hundred meters thick.
We hope you are able to travel to far-north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!
The Northern Lights are very worth seeing during your lifetime.
选项
A、真
B、假
C、Not Given
答案
A
解析
利用题干句中的特征词worth seeing作为线索,在文中进行搜索,发现相关句“Wehope you are able to…see the Northern Lights at least once during your lifetime.”与题干句意思吻合。
转载请注明原文地址:https://kaotiyun.com/show/TdAR777K
本试题收录于:
英语(二)题库公共课分类
0
英语(二)
公共课
相关试题推荐
对u/c的正确性检验中,要求每个数据类列仅能有一个C属于____________。
绘制数据流程图时首先要建立的是_________。
数据流程图的特点有:___________。
Americansareaveryenergeticandmobilepeople,alwaysontherun,rushingfromoneappointmenttoanother,fromaPTA(Parent-Tea
Amongthecompanywasalawyer,ayoungmanofabouttwenty-five.Onbeingaskedhisopinion,hesaid,“Capitalpunishmentandlife
Amongthecompanywasalawyer,ayoungmanofabouttwenty-five.Onbeingaskedhisopinion,hesaid,“Capitalpunishmentandlife
Weallbelievethatmodemtechnologycanmakelifebetterbecauseitmakeseverythingfaster.Butby(11)______everythingup,
Weallbelievethatmodemtechnologycanmakelifebetterbecauseitmakeseverythingfaster.Butby(11)______everythingup,
Wereceived______(value)helpfrommanystudentsinourresearch.
UnderstandwhatJetLagis,andhowacarefuldietcan______(minimum)itsworsteffects,andyourflightswillbelessstressful.
随机试题
滚动轴承定向装配前,要测出轴承及相配零件配合表面的()和方向。
用现代标点符号标点下面的文言短文。五曰天無私覆也地無私載也日月無私燭也四時無私行也行其德而萬物得遂長焉黄帝言曰聲禁重色禁重衣禁重香禁重味禁重室禁重堯有子十人不舆其子而授舜舜有子九人不舆其子而授禹至公也晉平公問於祁黄羊曰南陽無令其誰可而爲之祁黄羊對曰解狐可
脂肪进入小肠可以引起
治疗肾阳不足、命门火衰的阳痿宫冷,腰膝冷痛等,宜选用的药物是
足月儿,有窒息史,生后第2天嗜睡,面色微绀,呼吸频率32次/分,心率95次/分,前囟紧张,心音较低钝,四肢肌张力差,拥抱反射消失。最可能的诊断是
为社会提供公证数据的产品质量检验机构,必须经()对其计量检定、测试的能力和可靠性进行考核。
下列各项中属于直接费的有()。
成书于商周之交的()是中国最古老的哲学著作。是中国古代文化思想的重要源头之一。
牡丹∶洛阳∶郑州
Itwashardtopicturethesemi-opaquemilkinShrekI.
最新回复
(
0
)