2010年职称英语《理工类B级》考点精粹四(19)

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 doesn’t 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 doesn’t carry its own oxygen supply.