Martha is a girl. She always smiles and says hello to others.A. shyB. friendlyC. crazyD.

问题补充：

Martha is a girl. She always smiles and says hello to others.

A. shy

B. friendly

C. crazy

D. healthy

答案：

A. shy

B. friendly

C. crazy

D. healthy

解析：考查形容词的用法。根据第二句中的描述，女孩爱笑、乐于与人交往，表明她“friendly”。故选B。