单选题 The nurse is preparing to begin one-person cardiopulmonary resuscitation. The nurse should first
A. establish unresponsiveness.
B. call for help.
C. open the airway.
D. assess the client for a carotid pulse.

【正确答案】 A
【答案解析】The correct sequence begins with establishing unresponsiveness. The nurse should then call for help, assess the client for breathing while opening the airway, deliver two breaths, and check for a carotid pulse.