The nurse is caring for a client infected with methicillin-resistant Staphylococcus aureus (MRSA). What's the major infection control measure to reduce MRSA and other nosocomial pathogens in a health care setting ？（）

A．Using antibacterial soap when bathing clients with MRSＡ.

B．Conducting culture surveys periodically.

C．Ensuring that personnel wash their hands before and after contact with every client.

D．Using specific housekeeping practices for environmental cleaning.

电报的发明者莫尔斯以前是个画家，一次偶然的机会是他对魔术师的表演产生了“能不能用电流传递信息”的疑问此后他从事电学研究，经过5年的学习和探索，终于发明了电报机，从莫尔斯可以看出[ ]

A、创新和科学发明是一件简单的事情

B、科学发明靠的是偶然的机会

C、学习和积累对于科学发明来说没有实际意义

D、知识是创新的前提，没有知识的积累就没有创新的发现