He found a magazine ________with the owner’s name ________on the desk

with the back cover ________off. 

A．marking, lying, torn

B．marked, lying, torn

C．marked, laid, tearing

D．marking, laying, tearing

锅炉的汽水系统一般由省煤器、（）、下降管、（）、过热器、（）等设备组成。