D.Sleep rhythms are disruped.
19.According to the speaker what sometimes causes people to have trouble sleeping?
A.Failure to rest during the day.
B.Lack of sleep on weekends.
C.Vigorous exercise in the evening.
D.Eating cheese before going to bed.
20.Where is the talk most probably being given?
A.At a radio station.
B.In a lecture hall.
C.In a biology lab.
D.At the doctors office.
answers:
1.B 2.B 3.A 4.C 5.D 6.C 7.B 8.D 9.A 10.D
11.B 12.D 13.A 14.B 15.A 16.C 17.D 18.B 19.C 20.A
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