单项选择题

Which of the following is TRUE about taking a nap

A．Napping for 2 hours is better than for 40 minutes.
B．It does not revive you ff the nap lasts too long.
C．You should never take a nap after lunch.
D．The longer you sleep, the better you will feel.
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单项选择题
The word sine qua non in the last sentence of the 5th paragraph most probably means
A．indispensable condition.
B．good quality.
C．exceptional circumstance.
D．new concept.
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