80. We all don’t like the boy for his miser(吝啬), but he has the ______ actively to get near us because he has no little friends to play together with.

A．cheer

B．busy

C．face

D．Cheek

自发性气胸的体征特点为（）

A.患侧胸廓饱满

B.肋间隙增宽

C.呼吸运动增强

D.叩诊呈鼓音

E.气管及纵隔向患侧移位