听力原文：W: Doctor, I haven't been able to get enough sleep lately, and I'm too tired to concentrate in class.M: Well, you know, spending too much time indoors with all that artificial lighting can do that to you. Your body loses track of whether it's day or night.Q: What does the man imply?(13)A.The woman is making too big a fuss about her condition.B.Fatigue is a typical symptom of lack of exercisE.C.The woman should spend more time outdoors.D.People tend to work longer hours with artificial lighting.
A.M:
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C.The
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B.Fatigue
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C.The
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D.People