"There is a growing sense that when we eat and when we sleep are important parts of how healthy we are，" says Steven Shea，director of the Sleep Disorders Program at Brigham and Women's Hospital in Boston.

　　One way to learn about how our body clocks tick is to mess them up and see what happens.That's what neurologist (神经病学家) Frank Scheer and his workmates did in a recent study.

　　Staying up night after night，their studies suggest，could make kids extra hungry and more likely to gain weight.And regularly sleeping too little，Scheer says，may be one cause of the recent increase in childhood obesity (肥胖)．

　　【语篇解读】　这是一篇说明文。文章主要讲了长期形成的生物钟会影响我们的生活，生物钟紊乱会对身体产生不好的影响。

　　1．What will happen if you forget about the clock according to the passage?

　　A．You will feel upset.

　　B．You will behave normally.

　　C．Your body will not know what time it is.

　　D．You will probably get hungry more easily.

　　B　[细节理解题。根据第二段"You'll probably get hungry when you normally eat and tired when you normally sleep.Even though you don't know what time it is，your body does."可知，如果你忘记了时间，你还是会在正常吃饭的时间吃饭，在正常睡觉的时间睡觉，你的身体会正常的工作。故选B。]

　　2．What does "circadian rhythms" probably mean?

　　A．Habits.

　　B．Body chemicals.

　　C．Clock­like systems.

　　D．Bad consequences.

C　[词义猜测题。日常生活的这些模式被称为"circadian rhythms"，下文是对这个模式的解释说明，从下一句"Inside our bodies are several clock­like systems that follow a roughly 24­hour cycle."以及下一段"Everyone's rhythms are different