白蚁的群体中有雌蚁、雄蚁、工蚁和兵蚁，并且它们之间有明确的分工．白蚁的这种行为属于（　　）

A．繁殖行为

B．社会行为

C．取食行为

D．防御行为

______ was reported in the paper, people in mainland China sent disaster relief materials to

help the flooded area in Taiwan Island. [ ]

A. It

B. As

C. What

D. That