2. 外语
  3. Night-shift workers are those who_________. Night-shift workers often find it difficult to sleep in the morning because _______

Night-shift workers are those who_________. Night-shift workers often find it difficult to sleep in the morning because _______

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问题 Night-shift workers are those who_________.
Night-shift workers often find it difficult to sleep in the morning because _________.
选项 A、their internal clock will not allow them to
B、they are often disturbed by morning visits
C、they are not trying hard enough to do so
D、they are too tired to go to sleep well
答案A
解析 为什么值夜班的工人在早上难以入睡呢?从短文中的举例说明怎样安排睡眠模式可知，原因在于人体内的自然节律，也就是内部时钟，故答案选A。
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