单选题：What did Werner J. A. Dahm of the University of Michigan say

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题目内容：
What did Werner J. A. Dahm of the University of Michigan say about the Hyper-X test flight? A．It indicated the birth of a very fast airplan
B．It was self-powered，so it lasted only 11 second
C．It can transport cargo quickly and cheaply to the brink of spac
D．It is a major milestone in the journey of making a new type of very fast airplane
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