单项选择题

Why is coming back to work tiresome

A．People don't like to work.
B．They are too tired during the holidays.
C．A few days' holiday is not enough for people to have a good rest.
D．People' s body clock is disrupted during the holidays.

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单项选择题Which of the following concerning the internal clock structure is NOT true

A．Our daily routine and realities are very important to maintain the internal clock structure.
B．People should keep themselves busy in order to maintain the internal clock structure.
C．Once the internal clock structure is disrupted, we feel very uncomfortable.
D．Once the internal clock structure is disrupted,it takes some time for the structure to function properly again.

单项选择题What is the main idea of the article

A．Our internal clock mechanism doesn' t like rest, so keeping our routines is the key to good health.
B．We need longer holidays as we still feel tired after holidays.
C．There is a biological reason why people feel uncomfortable during holidays.
D．Holidays are part of our lives though we don' t actually enjoy them.