What does the man imply ？（）

单项选择题Princeton professor Freeman Dyson thinks that （）.

A．scientists will find alien life similar to ours
B．humans will be able to settle on Mars
C．alien life will likely be discovered
D．life will start to evolve on Mars

单项选择题Why does the man say he can’’t submit his assignment on time ？（）

A．He needs help to retrieve his files.
B．He has to type his paper once more.
C．He needs some time to polish his paper.
D．He will be away for a two-week conference.