46. What is the article mainly about?
(A) Light is the key to a good night’s sleep.
(B) Body clock is linked to mood disorder.
(C) Sleep and wake up early can boost your health.
(D) Life is really harder for night owls.
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統計: A(183), B(15), C(15), D(4), E(0) #2027625
統計: A(183), B(15), C(15), D(4), E(0) #2027625