Try this: for a whole day, forget about the clock. Eat when you're hungry and sleep when you're tired. What do you think will happen?
You may be surprised to find that your day is much like most other days. 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.
Inside our bodies are several clocklike systems that follow a 24- hour cycle. Everyone is unique, which is why you might like to stay up late while your sister always wants to go to bed early.
Regularly staying up late can make kids do worse on tests and quizzes. And working shifts at night leads to higher rates of heart disease.
"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 Research Program at Brigham and Women's Hospital in Boston.
"During the night, we are prepared to sleep," Shea says. "During the day, we are prepared to eat and move around, If you reverse ( 颠倒) what you are doing, everything is out of phase. "That can have adverse consequences.

阅读下面图表，按照要求回答问题。

春晖中学在学校读书节期间对1000多名在校生进行了一次调查。其结果如下：

                                                   中学生阅读方法调查结果

1929——1933年资本主义经济危机的具体表现是：①影响到整个资本主义世界，造成工业、农业、商业和货币金融等部门的危 机；②从1929年到1933年，前后共5个年头；③1933年与1929年相比，整个资本主义世界工业生产下降1／3以上，资本主义世界贸易总额缩减了 2／3。

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