Dictionaries say that “spring fever” is a lazy or restless feeling . People usually have the feeling on the first warm day of spring. Everyone has probably felt it at one time or another . people have talked about it for years.

Recently, scientists have taken a good look at spring fever. What they found is quite surprising.

In many places we live in , the winter months often seem dark and dreary. When spring comes late March , the world becomes colorful . The number of daylight hours grows with each passing day. According to many scientists, all the sunlight sets off chemicals in the brain (大脑). The chemicals make our feeling change and bring on spring fever.

小题1:How do people who have spring fever feel ?

A．active

B．awake

C．energetic

D．restless .小题2:Scientists think that _________ cause(s) spring fever .

A．colors

B．sunlight

C．dark

D．illness小题3: According to the passage ,the underlined word “dreary ”means“______” in Chinese.

A．沉闷的

B．暖和的

C．晴朗的

D．明亮的小题4:The best title for the passage is ______________ .

A．How to Get Over Spring Fever

B．Spring Fever

C．Darkness in winter

D．Spring and winter

（）有最多变的数据结构和最少定义的很好的操作以及完整限制。

A、记录模型

B、关系模型

C、层次模型

D、网络模型