—It smells terrible. What has happened here?

—Look, there is a chemical factory ____waste water___ the river.

A. pour; into            B. pouring; into         C. poured; to

右图为甲状腺活动调节示意图，请据图回答

垂体还能分泌与甲状腺激素有协同作用的（）激素，促进人体正常的生长发育。