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!
1.the suns gravity is too weak to keep its plasma from flowing to the earth.
a. right b. wrong c. not mentioned
解析:
题干的意思是:太阳的重力太弱,等离子逃离太阳,流向地球。这一说法与文章第一段第一句和第二句表达的意思不符。句子表达的重点不是太阳的重力太弱,而是太阳太热,其活动有太剧烈,造成等离子逃离太阳,流向地球。
2.the earth is quite safe with a magnetic field surrounding it to protect it from the attack by the solar wind.
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