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【单选题】D With around 100 students scheduled to be in that 9 am Monday morning lecture, it is no surprise that almost 20 people actually make it to the class and only 10 of them are still awake after the firs...
A.
Functions of the body clock.
B.
The “night owl” phenomenon.
C.
Human beings’ sleep behaviour.
D.
The school schedule of “early bird”.