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题目材料：

While the history of the Earth`s moon is well understood, the origin of the Martian moons, Phobos and Deimos, is still a mystery in spite of numerous space missions sent to Mars. One theory, based on striking similarities between the physical characteristics of the surfaces of Mars` moons and the surfaces of numerous objects in the asteroid belt, is that the Martian moons were formed far away from Mars and then captured by the planet`s gravitational attraction. However, this theory cannot account for the current near-equatorial and near-circular orbits of the moons. The fact that these orbits are consistent with expected orbits of objects accreted around Mars motivated some astrophysicists to propose instead that Phobos and Deimos were formed from a disk of debris in Mars` orbit.

The passage suggests that if the Martian moons were formed far away from Mars, it is likely that

A.their surfaces would differ greatly from the surface of asteroids
B.their orbits would be much less equatorial and circular in nature
C.their capture by Mars' gravity would produce a disk of debris around Mars
D.their orbits would be similar to the orbit of the Earth's moon
E.their origins would be impossible to discover by sending space missions to Mars

B显示答案

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