The role of the body clock is to Which of the following is NOT mentioned as a reason for the disrupted sleep of travelers?

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问题 The role of the body clock is to
Which of the following is NOT mentioned as a reason for the disrupted sleep of travelers?

选项 A、Crossing different time zones.
B、Changing light and activity levels.
C、Working longer hours.
D、Watching out of the plane for a long time.

答案D

解析
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