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60. According to William Dement, what do most people know about apnea?
(A) It is a well-known symptom.
(B) It is an unnoticed disorder.
(C) It is a major cause for insomnia.
(D) It is a major cause for high blood pressure
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統計： A(56), B(251), C(20), D(8), E(0) #1600118
統計： A(56), B(251), C(20), D(8), E(0) #1600118