TOEFL Listening: ETS-TOEFL听力机经 - 58VK1A33LE34IN4NP$

What is the main purpose of the lecture? A. To explore the possibility that life may have once existed on Titan B. To show how evidence of water on Titan was detected C. To discuss recent findings about precipitation on Titan D. To explain howthe moons of Earth and Saturn have evolved similarly