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  3. The Hyper-X broke the record because What kind of engine did the Hyper-X use?

The Hyper-X broke the record because What kind of engine did the Hyper-X use?

admin2009-05-21  42
问题 The Hyper-X broke the record because
What kind of engine did the Hyper-X use?
选项 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.
答案C
解析 文章第二段和第三段最后一句话的内容告诉读者，超音速飞机之所以能达到如此的超音速，是因为它使用的发动机是超音速冲压式喷气发动机。超音速冲压式喷气发动机和火箭的发动机一样快，但却不需要携带自身的氧气供给。
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