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 0xygen supply．
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What is the correlation between body weight and heart disease and blood pressure？
A. Ten per cent less body weight means ten per cent less risk of heart disease and high b1ood pressure？
B. Thirteen per cent more body weight means ten per cent more risk of heart disease and high blood pre88ure．
C. The more body weight one gain8，the more risk of heart disease and high blood pressure he has．
D. The less body weight one gains，the more risk of heart disease and the less risk of high blood pressure he has．
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