题目内容
（请给出正确答案）
[主观题]
According to Dr. David, Americans ______.A．are ideally vigorous even under the pressure of
According to Dr. David, Americans ______.
A．are ideally vigorous even under the pressure of life
B．often neglect the consequences of sleep deficit
C．do not know how to relax themselves properly
D．can get by on 6.5 hours of sleep
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