4. The auroras are formed when the electrons falling into the Earths atmosphere at the poles and colliding with gas molecules in the atmosphere.
5. You cannot see the Northern Lights unless you are in Alaska or Canada.
6. Tens of thousands of tourists take special trips to Norway and Sweden every year to watch the Northern Lights.
7. An aurora is generally close to the ground and is very long and thick.
答案:BACABCB
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