When asked to explain _____ he does to make his students so fascinated with his lessons, the teacher

paused and thought deeply. [ ]

A. what it is that

B. that what it is

C. what is it that

D. that what is it

草原防火规划主要包括（）。

A.草原防火规划制定的依据

B.草原防火组织体系建设

C.草原防火基础设施和装备建设

D.草原防火物资储备及保障措施