The boy wanted to go on a trip to Tibet alone, but his mother told him________. [ ]

A. not to do    

B. not do it

C. not to  

D. do not do it

扑救大面积火灾最理想的方法是用（）灭火。

A、沙土

B、干粉

C、蒸气

D、二氧化碳