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题库 / Prep2007E1-SC-136
It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
may be caused by the interaction where two stars orbit each other
may be caused by the interaction between two stars that each orbit the other
are because of the interaction between two stars that orbit each other
are caused by the interaction of two stars where each is orbiting the other
are caused by the interaction of two stars orbiting each other
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1) 语意重复，may与likely所表达的都有“可能的”含义，不能同时使用。
2) because of…的表达不及动词形式cause更有效。
(A) may与likely语意重复;此处不应该用关系代词where，因为没有明确表示地点。
(B) may与likely语意重复;each…the other搭配错误。
(C) be because of sth不及动词形式be caused by更有效;each…the other搭配错误;where用法错，原因与A选项相同。
(D) where用法错，原因与A选项相同;each…the other搭配错误。
(E) 正确，be caused by简洁有效地表达原因，现在分词orbiting…作后置定语修饰名词stars。
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