—Why are you in such a hurry？

—I was told that my mother had been sent to the hospital. I have to leave               .[ ]

A. before long    

B. right now

C. from now on    

D. all the time

下列各项中属于我国目前资源税的征税范围的是( )。

A．人造石油

B．煤矿生产的天然气

C．中外合作开采陆上石油

D．盐