What is a cause for the change of Stefanias body clock?
A. Eating fewer meals.
B. Having more hours of sleep.
C. Lacking physical exercise.
D. Getting no natural light.
正确答案:D
What is a cause for the change of Stefanias body clock?
A. Eating fewer meals.
B. Having more hours of sleep.
C. Lacking physical exercise.
D. Getting no natural light.
正确答案:D