【单选题】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 th...
A.
The woman is 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.