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【单选题】Passage Two Everybody sleeps, but what people stay up late to catch—or wake up early in order not to miss—varies by culture. From data collected, it seems the things that cause us to lose the most sle...
A.
They have trouble falling asleep.
B.
They want to get sufficient sleep.
C.
They are involved in a sleep research.
D.
They want to go to bed on regular hours.