首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
The Northern Lights The Sun is stormy and has its own kind of weather. It is...
The Northern Lights The Sun is stormy and has its own kind of weather. It is...
admin
2020-12-24
34
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 trapped in the belts to fall into the Earth’s atmosphere at the poles. As the electrons fall to 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 glows 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 (北极光)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 (跳动),flicker (闪烁),or even move like waves. During solar maximum,5 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!
Which of the following statements is true of the Northern Lights?
选项
A People cannot see them unless traveling to Alaska or Canada.
B Their movement is slow enough to be observed with the eyes.
C They are very close to the ground.
D They are very long and thick.
答案
B
解析
第四段明确表述了 “The movement of the aurora across the sky is usually slow enough to easily follow with your eyes…”,极光的移动通常比较慢,肉眼即可轻松观察到。故答案为B。选项A忽略了 “normally”,因为“在太阳风活跃时段,在佛罗里达都能看到,甚至远在墨西哥也可以”。参照第四段倒数第二句“……最低的距地面也有100千米”,可知选项C表述错误。参照第四段末句“……只有几百米厚”,可知选项D与事实不符。
转载请注明原文地址:https://ti.zuoweng.com/ti/2L9QKKKQ
相关试题推荐
共用题干 StanfordUniversity1StanfordUniversity,famousasoneofnorthernCali...
共用题干 StanfordUniversity1StanfordUniversity,famousasoneofnorthernCali...
共用题干 StanfordUniversity1StanfordUniversity,famousasoneofnorthernCali...
共用题干 StanfordUniversity1StanfordUniversity,famousasoneofnorthernCali...
共用题干 StanfordUniversity1StanfordUniversity,famousasoneofnorthernCali...
Thepriceofvegetablesvariesaccordingtotheweather.A:jump B:risesC:falls
TheNorthernLights TheSunisstormyandhasitsownkindofweather.Itis...
TheNorthernLights TheSunisstormyandhasitsownkindofweather.Itis...
TheNorthernLights TheSunisstormyandhasitsownkindofweather.Itis...
共用题干 第二篇TheFirstNavigationalLightsIntheNewWorld,navigationallightswe...
随机试题
11.某2层地上商店建筑,每层建筑面积为6000m2,所设置的自动喷水灭火系统应
儿科护士定期到某小学为低年级学生测量身高、体重,检查五官,取外周血测血象。同时了
从业人员对待顾客的做法中,你能够认可的是()。 A.顾客是“上帝”,顾客说怎
继电保护、自动装置、控制、信号的二次回路的工作电压不应超过()。
斧头:劈:木柴
B
护士小王,护理过一位传染病患者之后刷洗双手,她刷手时的正确顺序是()。A.前臂,腕部,指甲,指缝,手指,手背,手掌B.手掌,腕部,手指,前臂,指甲,指缝
咬肌浅层A.起自颞窝和颞深筋膜深面,止于喙突和下颌支前缘直至下颌第三磨牙远中B.起自颧弓深面,垂直向下,止于下颌支上部和喙突C.起自上颌骨颧突和颧弓下缘的前
代理人在代理权限内,以被代理人的名义实施民事法律行为,对此行为承担民事责任的是()。A.代理人B.被代理人C.第三人D.法定代理人
在采用取票制的预订客票情况下,旅客运输合同的要约是()。A:旅客预定客票的行为B:承运人确认旅客已订到客票的行为C:旅客取票并支付票款的行为D:承运人主动