Which of the following might be the best title of the passage、

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• 1According to the passage, NASA will launch a satellite to _____.

  A.take images of the solar system

  B.provide early warning of thunderstorms

  C.keep track of solar activities

  D.improve the communications on Earth

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• 2What can be inferred about the solar activity described in the passage、

  A.The most fatal matter from the corona falls onto Earth.

  B.The solar storm peak occurs in the middle of each cycle.

  C.It takes several seconds for the charged matter to reach Earth.

  D.The number of sunspots declines after coronal mass ejections.

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• 3The phrase "communications blackout" in paragraph 1 most probably refers to _____during the 2012 Olympics.

  A.the extinguishing of the Olympic torch

  B.the collapse of broadcasting systems

  C.the transportation breakdown in London

  D.the destruction of weather satellites

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• 4Who might be most interested in this piece of information、

  A.Job hunters.

  B.Employees in blue-chip companies.

  C.Mid-level managers.

  D.Researchers on employee turnover.

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• 5As is mentioned in the card, the limitation of the research paper mainly lies in that_____.

  A.the data analysis is hardly reliable

  B.the research sample is not wide enough

  C.the findings are of no practical value

  D.the research method is out-of-date

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