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题目材料：

Modern radar observations indicate that the bodies making up Saturn's rings range from small grains to bodies several meters in diameter. This generates some uncertainty about the origin of the material that composes the ring system. One theory is that the orbit of a small satellite diminished until its proximity to Saturn caused it to be torn apart by the planet's tidal forces, breaking it up into bodies a few tens of kilometers in diameter. Further fragmentation by tidal forces would have been unlikely, however, since the effectiveness of tidal forces increases with the size of the body on which they act.Subsequent collisions between these initial bodies could have been the events that produced the finer material to form the rings.

Based on information in the passage, which of the following best describes the "subsequent collisions" ?

A.They must be considered highly speculative because evidence that collisions of this kind occur at all is sparse.
B.They are hypothetical events that provide a way to account for certain findings from radar observations
C.They most likely occurred immediately following a near collision between Saturn and a satellite.
D.They are unlikely to have occurred because the tidal forces that would be necessary to produce them were probably not strong enough to do so.
E.They could have been responsible for some of the material in Saturn's rings but cannot account for the observed presence of other kinds of material in the rings.

B显示答案

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以上解析由考满分老师提供。

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