单选题：What does NASA plan to do?

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题目类型：单选题
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题目内容：

What does NASA plan to do? 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.

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以上作文是某高中三年级学生的一篇习作，请认真阅读，然后为其写一段不少于200字的评析。

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