听力原文:W: Doctor,I haven't been able to get any sleep recently,and I'm too tired to conc
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 doctor imply the woman should do?
(19)
A.Spend more time outdoors.
B.Take short naps in day time.
C.Try to go to bed earlier.
D.Stay indoors until she feels better.