The auroras are formed when the electrons falling into the Earth’s atmosphere at the poles and colliding with gas molecules in the atmosphere.

试卷相关题目

• 1Some scientists are worrying about the possible disappearance of the Earth’s protective magnetic field in the future.

  A.Right

  B.Wrong

  C.Not mentioned

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• 2The 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

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• 3The Sun’s gravity is too weak to keep its plasma from flowing to the Earth.

  A.Right

  B.Wrong

  C.Not mentioned

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• 4Norman Blarney is an artist of deep <u>convictions</u>.

  A.statements

  B.beliefs

  C.suggestions

  D.claims

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• 5In thelatter case the <u>outcome </u>can be serious indeed.

  A.result

  B.judgment

  C.decision

  D.event

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• 6You cannot sec the Northern Lights unless you are in Alaska or Canad

  A.A.Right

  B.Wrong

  C.Not mentioned

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• 7Tens 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

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• 8An aurora is generally close to the ground and is very long and thick.

  A.Right

  B.Wrong

  C.Not mentioned

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• 9What is so special about WISE、

  A.It is small in size but carries a large camera.

  B.It is as small as a trashcan.

  C.Its digital camera can help astronomers to see the unknown space.

  D.Never before has a telescope carried a digital camera in spac

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• 10Which is NOT the synonym for the word "snap" in the third paragraph、

  A.make.

  B.shoot.

  C.take

  D.photograph.

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