问题补充：
Some time after the rockets and the space shuttle are , the rocket will the space shuttle and the sea.
A. set sail; broadcast; drop in
B. ruled out; orbit; show up
C. stepped up; survive; fall for
D. launched; separate from; fall into
答案：
A. set sail; broadcast; drop in
B. ruled out; orbit; show up
C. stepped up; survive; fall for
(答案→)D. launched; separate from; fall into
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。
