【单选题】听力原文:Ever since the Apollo moon landings, the idea of human expeditions to the Mars has come up repeatedly as the kind of grand adventures that would give focus, purpose, and inspirational lift to the...
A.
It is a first step to explore outer space.
B.
It is a follow-up action of the Apollo moon landings.
C.
It is a compromise to the exorbitant human expeditions to the Mars.
D.
It is a compensation for the wishful thinking of human landing on the Mars.