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.
查看答案
【C6】
A. should
B. could
C. might
D. must
Which of the following statements is true？
A. The author's father built a bonfire on VE Day.
B. The author's father had fought in the First World war
C. The author's father had fought in the Second World War.
D. The author's father threw two chairs on the fire to keep it going.
What kind of engine did the Hyper-X use？
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.
It is implied in the concluding paragraph that______.
A. European old member countries are poor and homogenous
B. Europe's leaders are bewildered by the crucial summit
C. Europe's politicians should heed their voters' dissatisfaction
D. European coincidences might emerge due to the economic stagnation
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