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单项选择题


Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage.

What is NOT mentioned as a factor contributing to insomnia

    A.Resting frequently during the day.
    B.Doing little exercise.
    C.Sleeping late on weekends.
    D.Having heart disease.
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