职称英语考试

试题来源：2015年职称英语《理工类》考前强化训练卷5
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, 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 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!
16. The Sun’s gravity is too weak to keep its plasma from flowing to the Earth.
A. Right B. Wrong C. Not mentioned
17. The Earth is quite safe with a magnetic field surrounding it to protect it from the attack by the solar wind.
A. Right B. Wrong C. Not mentioned
18. Some scientists are worrying about the possible disappearance of the Earth’s protective magnetic field in the future.
A. Right B. Wrong C. Not mentioned
19. The auroras are formed when the electrons falling into the Earth’s atmosphere at the poles and colliding with gas molecules in the atmosphere.
A. Right B. Wrong C. Not mentioned
20. You cannot sec the Northern Lights unless you are in Alaska or Canada.
A. Right B. Wrong C. Not mentioned
21. Tens of thousands of tourists take special trips to Norway and Sweden every year to watch the Northern Lights.
A. Right B. Wrong C. Not mentioned
22. An aurora is generally close to the ground and is very long and thick.
A. Right B. Wrong C. Not mentioned

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网考网参考答案：B、A、C、A、B、C、B
网考网解析：进入考试题库查看解析
大数据分析：根据网考网与考试题库的统计分析，该试题：
63%的考友选择了A选项
14%的考友选择了B选项
23%的考友选择了C选项
考友解析与评论：
 · 题目都看不懂，整个就是乱蒙。
 · 这个答案肯定不对
 · 我也选错了，不过这个题书上有原话