47. When did the research find people had the latest bedtimes and the shortest amount of sleep?
(A) Three to five days after a full moon.
(B) Three to five days before a full moon.
(C) During the last five days of a full moon.
(D) Five days before the 29.5-day moon cycle.
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統計: A(19), B(291), C(31), D(42), E(0) #2756896
統計: A(19), B(291), C(31), D(42), E(0) #2756896