the effect of I oss of s I eep i n face\rof urgent and absorbing demands may be the greatest source of danger.\rPeopIe may think they are more e fficie n t than they really are..\rIt can be inferred from the passage t h a t .\rA. different people may have quite different sleep requirements\rB. we can leave our bodies to regulate our sleep requirement for itself\rC. we can maintain normal behavior and working standards no matter how\rmueh we have slept\rD. we may remain efficient even if we have one night' s loss of sleep\r50. A. It was ordinary. B. It was enjoyable. C. It was\racceptable. D. It was te rrib le .
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