[单项选择]　　Your’’re off work and hanging out at home. 　　Off your diet and into cookies, big dinners and champagne. 　　Off your schedule, and up nights with movies, videos or a good book. 　　Off your workout routine and skipping your morning swim or evening run. 　　In short, you’’re off, free of responsibilities and pressure, stuffed full of food and fun. And you don’’t like it. 　　"All humans, and for that matter all species that are vertebrates and many that are not, have internal clock mechanism, "said George Brainard, professor of neurology at Thomas Jefferson University in Philadelphia." That’’s not a metaphor. It’’s an actual biological entity." 　　As many people find themselves in the second week of enforced indolence because of the winter break -- whether because of school holidays or time off from work -- more than a few may be experiencing a peculiar sensation. 　　A wave of discontent at the luxury of doing nothing, of sitting around with time to spare, the commodity of the late 20th
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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