单选题：What kind of engine did the Hyper-X use?

题目分类：理工类
题目类型：单选题
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题目内容：

What kind of engine did the Hyper-X use? A．A jet engine that carries its own oxygen supply.
B．A jet engine that uses no oxygen.
C．A scramjet engine that doesn't carry its own oxygen supply.
D．A rocket engine that carries its own oxygen supply.

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