ZT-Astronomy: Titan

天文学
Titan


1. What’s the professor’s main point about Titan?

  • A. Titan’s atmosphere is causing its surface conditions to slowly change.
  • B. The chemical processes that occur on Titan are unique in the history of the solar system.
  • C. Research on the atmospheric conditions on Titan may help explain how it came into existence.
  • D.  Studying Titan can help provide a better understanding of conditions on early Earth.

2. Why does the professor the amount of sunlight that Titan receives?

  • A. To acknowledge that the differences between Earth and Titan are significant.
  • B. To out point that many chemical processes are dependent on the presence of sunlight.
  • C. To explain why it is surprising that pools of liquid are present on Titan’s surface.
  • D. To point out a similarity between Titan and Earth’s moon.

3. What point does the professor make about the methane on Titan?

  • A. It only exists as a liquid.
  • B. It is a minor component of Titan’s atmosphere.
  • C. It acts like water does on Earth.
  • D.  It may have originated on Saturn.

4. What does the professor say about meteor craters on Titan?

  • A.  Ice on the surface has covered them.
  • B.  Methane rain has eroded them.
  • C.  Pools of liquid methane have filled them in.
  • D. Water ice ejected from volcanoes has eroded them.

5. Why does the professor mention the season on Titan in which the study of its largest lake was conducted?

  • A. To suggest that the study was too short.
  • B. To make a point about cycles of precipitation and evaporation.
  • C. To acknowledge a difference between weather cycles on Earth and Titan.
  • D. To describe a theory that explains freezing and thawing cycles on Titan.

6. Why is the professor excited about the presence of ammonia on Titan?

  • A. Ammonia may have been the result of atmospheric changes on early Earth.
  • B. Ammonia was present in significant quantities on Earth when life first appeared.
  • C.  The presence of ammonia has motivated scientists to look for atmospheres on other moons.
  • D. The presence of ammonia often coincides with a rise in oxygen levels.

答案:D A C B B B

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