2. 外语
  3. People who work night shifts are constantly fighting against an “internal clock” in their bodies. Quite often the clock tells th

People who work night shifts are constantly fighting against an “internal clock” in their bodies. Quite often the clock tells th

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问题     People who work night shifts are constantly fighting against an “internal clock” in their bodies. Quite often the clock tells them to sleep when their job requires them to remain fully awake. It’s no wonder that more accidents happen during night shifts than at any other time. Light therapy(光照治疗法)with a bright light box can help night-shift workers adjust their internal clock. However, many doctors recommend careful planning to help improve sleep patterns For example, night-shift workers often find it difficult to sleep in the morning when they get off work because the body’s natural rhythm(节律)fights back, no matter how tired they are. Some experts recommend that night-shift workers schedule two smaller sleep periods-one in the morning after work, and another longer one in the afternoon, closer to when the body would naturally need to sleep. It’s also helpful to ask friends and family to cooperate by avoiding visits and phone calls during the time when you are sleeping.   
Night-shift workers are those who ______．
选项 A、have to pay on their internal clock
B、need to re-adjust their clock
C、fall asleep late at night
D、have to work at night
答案D
解析 根据短文前两句可知，“night-shift workers“就是那些值夜班的工人。
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