GMAT
NASA's methodical approach to the exploration of Mars has not yet answered the questions of whether biological life forms ever emerged on Mars and whether, presuming such life forms left fossil traces to begin with, those traces still exist in some moist recesses of the cold and arid planet.
NASA's methodical approach to the exploration of Mars has not yet answered the questions of whether biological life forms ever emerged on Mars and whether, if it is presumed that such life forms left some fossil traces to begin with, can those traces still exist in some moist recesses of the cold and arid planet.
题目基本信息