The Hyper-X broke the record because What does NASA plan to do?

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问题 The Hyper-X broke the record because
What does NASA plan to do?

选项 A、To build one more Hyper-X aircraft.
B、To carry out three more Hyper-X experiments.
C、To make the aircraft fly higher and longer.
D、To test another hypersonic flight at 10 times the speed of sound.

答案D

解析 从文章的最后一段话可以推断,NASA计划下一次研发的超音速飞机速度达到声速的十倍。
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