Out of the three experimental Hyper-X aircrafts built for NASA5,only one is now left.The agency has plans for another 11-second hypersonic flight,this time at 10 times the speed of the sound.
练习:
1. The Hyper-X broke the record because
A it was the first air-breathing jet plane.
B it flew along the equator.
C it flew at speeds smaller than five times the speed of sound.
D it traveled at a supersonic speed.
2. What kind of an engine did the Hyper-X use?
A A jet engine that gets oxygen from the air.
B A scramjet engine that doesnt carry its own oxygen supply.
C A rocket engine that carries its own supply of oxygen.
D A iet engine that uses no oxygen.
3. What is NOT true about the scramjet engine?
A It goes slower than a rocket.
B It extracts oxygen from the air that flows through the engine.
C It works only at speeds greater than five times the speed of sound.
D It doesnt carry its own oxygen supply.
4. 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 airplane.
B It was self-powered,so it lasted only 11 seconds.
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