词汇7haipE5sCnik 5bu:stEp
equator n.赤道 milestonen.里程碑
scramjetn.超音速燃烧冲压式, cargon.货物
combustionn.燃烧 brinkn.边缘
1. The Hyper-X broke the record because
B it flew along the equator.
D it traveled at a supersonic speed.
A A jet engine that gets oxygen from the air.
C A rocket engine that carries its own supply of oxygen.
3. What is NOT true about the scramjet engine?
B It extracts oxygen from the air that flows through the engine.
D It doesnt carry its own oxygen supply.
A It indicated the birth of a very fast airplane.
C It can transportcargo quickly and cheaply to the brink of space.
5. What has NASA planned to do?
B To make three more Hyper-X experiments.
D To make the aircraft fly higher and longer.
1. C Hyper-X之所以打破纪录是因为它的飞行速度是音速的7倍。它不是第一架空气喷气式飞机,也不是第一架超音速飞机,所以A和D都不对。Hyper-X的试飞并未绕赤道飞行,所以B也是错误的选择。
3. A 根据第五段内容,B、C、D都是正确的说法。第四段最后一句告诉我们,A的说法是不正确的。
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