A. of the composition of lunar soil
B. the Moon has no atmosphere
C. the Moon has no active tectonic or volcanic activity
D. the surface gravity of the Moon is less
Đáp án là D. Ý trong bài: The surface gravity of the Moon is about one-sixth that of the Earth's. Therefore, a man weighing 82 kilograms on Earth would only weigh 14 kilograms on the Moon.
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