of life refer to?
A Water-based life.
B Methane-based life.
C Liquid-water-based microorganisms.
D Gas-based life.
4. What can be inferred from what Allen said?
A Scientists have different arguments over whether there is life on Titan.
B Scientists all agree that there is life on Titan.
C Scientists all suggest that a biological explanation is reasonable.
D Scientists all agree that a non-biological chemical reaction is a possible explanation.
5. Which of the following can replace the title of this passage?
A Earthlike Living Beings Found on Titan.
B Finding of One More Moon of Saturn.
C Titan,a New Satellite Found.
D A different Life Form, a Possibility.
答案与解析:
1. C 短文的第一段提供了答案。该段告诉读者,科学家在土星的卫星土卫六( Titan )上发现了生命的迹象,这些生命的存在是以甲烷为基础的。
2.A根据第二段Scientists have reportedly discovered clues showing primitive alien beings are
breathing in Titans dense atmosphere filled with hydrogen.,说明土卫六(Titan)有生命迹象。因此A是答案。
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