John was the only one of his family to ____ that bigearthquake. [ ]

A. leave          

B. remain      

C. survive    

D. live

隧洞洞身的哪种衬砌为不受力衬砌。（）

A、喷锚衬砌

B、预应力衬砌

C、平整衬砌

D、单层衬砌