I wonder how she _____like that to her parents.

[      ]

A. dare to speak

B. dare speaking

C. dared speak

D. dares speak

勤洗手，勤换衣，不随地吐痰等卫生习惯，可有效的预防传染病，这些行为属于（    ）

A．控制传染源

B．切断传播途径

C．保护易感人群

D．杀死病原体