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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Do you find getting up in the morning so difficult that it is painful? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle. Duri...
A.
Unawareness of energy cycles.
B.
Familiar monologues.
C.
A change in a family member's energy cycle.
D.
Attempts to control the energy cycle of other family member.
【单选题】Do you find getting up in the morning so difficult that it is painful? This might be called laziness, but Dr．Kleitman has a new explanation．He has proved that everyone has a daily energy cycle．During ...
A.
Unawareness of energy cycles.
B.
Familiar monologues.
C.
A change in a family member's energy cycle.
D.
Attempts to control the energy cycle of other family member.