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1、2022年2022年职称英语考试理工类B级阅读试题及答案14 职称英语B职称英语网权威发布2022年职称英语考试理工类B级阅读试题及答案14，更多2022年职称英语考试理工类B级阅读试题及答案14相关信息请访问职称英语考试网。 The Northern Lights The sun is stormy and has it own kind of weather. It is so hot and active that even the Suns gravity cannot hold its atmosphere in check! Energy flows away from the S
2、un 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 stre
3、ams toward the Earth, but dont worry because a protective magnetic fields 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. Wh
4、en a large blast of solar wind crashes into the Earths 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 Earths atmosphe
5、re 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 glows red and green and nitrogen glows violet-purple. As these various colors glow and dan
6、ce 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
7、 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
8、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
9、 never forget it! 1. The Suns gravity is too weak to keep its plasma from flowing to the Earth. A. right B. wrong C. not mentioned 2. 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 3. Some scientists ar
10、e worrying about the possible disappearance of the Earths protective magnetic field in the future. A. right B. wrong C. not mentioned 4. The auroras are formed when the electrons falling into the Earths atmosphere at the poles and colliding with gas molecules in the atmosphere. A. right B. wrong C.
11、not mentioned 5. You cannot see the Northern Lights unless you are in Alaska or Canada. A. right B. wrong C. not mentioned 6. 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 7. An aurora is generally close to the ground and is very long and thick. A. right B. wrong C. not mentioned第 4 页 共 4 页