A A jet engine that carries its own oxygen supply.
B A jet engine that uses no oxygen.
C A scramjet engine that doesnt carry its own oxygen supply.
D A rocket engine that carries its own oxygen supply.
33 Which of the following is NOT true of the scramjet engine?
A It has been used on passenger planes.
B The air it breathes does not put out the combustion flames.
C It works at speeds greater than five times the speed of sound.
D It goes as fast as a rocket.
34 What does Werner J.A.Dahm say about the Hyper-X test flight?
A It was unsuccessful because it lasted only 11 seconds.
B It is a very important event in developing very fast airplanes.
C,It allows people to fly at an altitude of 100,000 feet.
D It can transport cargo quickly and cheaply to outer space.
35 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.
第二篇 Stop Eating Too Much
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