Both of the reading and listening passages
deal with the same issue on the life on Mars. The author states that there will
be life on Mars. On other hand, the professor casts doubt on this.
According to the reading passage, there are
several signs (that) indicate the existence of
life (on Mars). Firstly, the great amount of
methane in Martian atmosphere may be the byproduct of methanogen. Second, the
green crystal in the Metroid (meteorite or meteor) from Mars may be the evidence of
existence of bacteria on Mars. Lastly, water can exist on Mars due to plenty of
methane.
However, according to the listening passage, the lecturer says that the reading passage’s claim is too optimistic. To begin with, lots of methane in Martian atmosphere may be the result