试题详情

Starting with the______that there is life on the planet Mars, the scientist went on to develop his a

at there is enough ice at the poles to cover the planet with water if it melts．Although there is no

at there is enough ice at the poles to cover the planet with water if it melts．Although there is no

at there is enough ice at the poles to cover the planet with water if it melts．Although there is no

istakeIs there water on the planet Mars?Is there life in Mars? Was there ever life on Mars? Scienti