单选题 There weren't any surprises there. The surprise I had was standing on the surface after we'd been there for a few minutes, having a chance to rest a little bit, and looking up at the earth for the first time-you have to look up because that's where it is. And the sky is totally black, and here you have a planet which is four times the size of the moon as we look at it from the earth, and you also have color. You have a blue ocean and the brown landmasses-the brown continents-and you can see ice on the ice caps on the North Pole, and so on.
The speaker was mostly probably talking his experience

• A. on the high mountain.
• B. under the ocean water.
• C. in an airplane.
• D. on the surface of the moon,