题目

将等物质的量的镁和铝混合，取等质量该混合物四份，分别加到足量的下列溶液中，充分反应后，放出氢气最多的是(   ) A．3mol/LHCl     B．4mol/LHNO3    C．8mol/LNaOH     D．18mol/LH2SO4 答案：A ---Excuse me, Sir. But smoking is not allowed here. ---Sorry, I didn’t see the sign. I’ll _______ my cigarette at once. 　 A. put out B. put away　 C. put up D. put off