案例分析题 The author's attitude towards the possibility of life on the Mars in the future is

A．within the next 200,000 years
B．only 200,000 years from now
C．only 150,000 years from now
D．as soon as the planet becomes cool enough

A．it supported life in the past
B．certain gases are used to cool the planet
C．the atmosphere can be heated enough to grow simple plants
D．the planet’s volcanoes become as active as they were in the past