What is the lecture mainly about?A. Evidence proving that water was once on Mars.B. Scientific analyses currently being done on mineral samples from Mars.C. Recent developments that could help determine whether life ever existed on Mars.D. An approach to determining whether amino acids on Earth originated on Mars.
第1个回答 2015-06-02
Professor: There's been a lot of talk recently about life on Mars, at the level of microorganisms anyway, mainly because of a few important discoveries and inventions. 教授说最近有很多关于火星上有生命的讨论，主要是因为有一些重要的发现和发明。因此 C 选项正确。
