1.hints of alien life:外星生命迹象。
3.NASA:美国国家航空航天局的缩写,全称是: National Aeronautics and Space Administration。
5.bugs:微生物。非正式口语表达,所以使用了引号。
7.principal investigator:研究项目负责人
练习:
A They have found a new moon orbiting Saturn.
C They have found methane-based life on Titan.
2. What do scientists say about Titan?
B There is acetylene there.
D Rivers and lakes there contain life formls.
A Water-based life.
C Liquid-water-based microorganisms.
4. What can be inferred from what Allen said?
B Scientists all agree that there is life on Titan.
D Scientists all agree that a non-biological chemical reaction is a possible explanation.
A Earthlike Living Beings Found on Titan.
C Titan,a New Satellite Found.
答案与题解:
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.,说明土卫六有生命迹象。因此A是答案。
4.A科学家至今对土卫六是否存在生物有不同的观点和解释。Allen 说要做出土卫六上有生
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