单选题Night-shift workers often find it difficult to sleep in the morning because _____.Atheir internal clock will not allow them toBthey are often disturbed by morning visitsCthey are not trying hard enough to do soDthey are too tired to go to sleep well
单选题
Night-shift workers often find it difficult to sleep in the morning because _____.
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
参考解析
解析：
判断推理题。题目询问“夜班工人发现清晨难以入睡的原因是什么？”从文章倒数第三句“Night-shift workers often find it...”可知，难以入睡是因为身体的自然规律被打破，此时体内生物钟不允许睡觉。正确答案为A。
判断推理题。题目询问“夜班工人发现清晨难以入睡的原因是什么？”从文章倒数第三句“Night-shift workers often find it...”可知，难以入睡是因为身体的自然规律被打破，此时体内生物钟不允许睡觉。正确答案为A。
相关考题：
单选题According to the passage, some doctors recommend that night-shift workers should _____.Ahave frequent visits and phone callsBimprove their family relationshipChave two smaller sleep periodsDrely mainly on light therapy
填空题____