The nurse is caring for a client who recently underwent a tracheostomy. The first priority when caring for a client with a tracheostomy is （）.

A．helping him communicate.

B．keeping his airway patent.

C．encouraging him to perform activities of daily living.

D．preventing him from developing an infection.

古人普遍相信鬼神，今人则流行相信外星人或类似神秘的东西。迷信在古今中外都如此______，让人怀疑那是否是人类______的一种本能。人们本能地要为事情的发生找出原因，在自己难以理解时，迷信的解释也聊胜于无。 填入划横线部分最恰当的一项是：

A．流行 一脉相承

B．盛行 与生俱来

C．泛滥 无师自通

D．普遍 如影随形