The English play __________ my students acted at the New Year’s party was a great success.

A．for which

B．at which

C．in which

D．on which

以下促进健康的行为中，属于二级预防的是（）。

A.保健行为

B.预警行为

C.求医行为

D.遵医行为

E.戒除不良嗜好行为