Some time after the rockets and the space shuttle are _____, the rocket will _____ the space shuttle and ____ the seaA.set sail; broadcast; drop inB.ruled out; orbit; show upC.stepped up; survive; fall forD.launched; separate from; fall into
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D解析考查短语辨析。set sail“起航”；rule out“排除”；step up“加速”；launch“发射”；orbit“绕轨道运行”。句意“火箭和飞船在发射一段时间之后，火箭会和飞船分离，落入海中。”故选D。