Why did the greenhouse-gas solution fail to explain the early presence of liquid water on Earth and Mars、 [Choose two answers]

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• 1Why is geological evidence of liquid water on Earth and Mars three to four billion years ago problematic、

  A.It suggests that the solar system is younger than it could possibly be.

  B.It suggests that the young Sun was less bright than it is today.

  C.It challenges the prevailing model of star formation.

  D.It contradicts theories about the beginning of the universe

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• 2What is the main propose of the lecture、

  A.To compare solutions to the greenhouse-gas problem

  B.To examine methods used to study star formation in other solar systems

  C.To discuss evidence for liquid water on young Earth and Mars

  D.To discuss attempts to solve a puzzle related to the Sun

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• 3Why does the professor say this、

  A.He does not approve of all the aspects of the shows.

  B.He does not think the events can be easily defined.

  C.He does not consider the shows to be authentic Dada.

  D.He does not know enough about the events to categorize them.

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• 4According to the professor, what contributed to the chaotic nature of the performances at the Cabaret Voltaire、 [Choose two answers]

  A.There were no professional actors.

  B.The script was torn up and allowed to fall to the floor during the performance.

  C.Different art forms shared the same stage.

  D.The performances varied from night to night.

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• 5What does the professor identify as aspects of traditional play、 [Choose two answers]

  A.Characters each have their own motivation.

  B.A plot is developed.

  C.The play consists of several acts.

  D.C.The play consists of several acts.D.Actors ignore the audienc

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• 6Why does the professor mention the solar wind、

  A.To explain a way the Sun is losing mass

  B.To point out that it was less intense billions of years ago

  C.To suggest a reason for early climate differences between Earth and Mars

  D.To explain the importance of solving the faint-young-Sun paradox

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• 7What factor did astronomers consider when calculating the required solar mass for liquid water to exist on Earth and Mars、

  A.The young Sun lost mass at a slower rate than it currently does

  B.The young Sun was closer to the planets than it currently is

  C.The young Sun had less solar wind activity than it currently does

  D.The young Sun comprised greater amounts of helium than it currently does

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• 8What is the professor's attitude about the bright-young-Sun solution、

  A.He is surprised that it is not more widely accepted

  B.He feels that it raises too many unanswerable questions

  C.He is confident that future research will determine whether it is true.

  D.He expects that other possible solutions to the paradox will be proposed.

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