Shortly after being admitted to the coronary care unit with an acute myocardial infarction (MI), a client reports midsternal chest pain radiating down the left arm. The nurse notices that the client is restless and slightly diaphoretic, and measures a temperature of 99. 6°F (37.6℃), a heart rate of 102 beats/minute; regular, slightly labored respirations at 26 breaths/minute; and a blood pressure of 150/90mmHg. Which nursing diagnosis takes highest priority

A. Risk for imbalanced body temperature.
B. Decreased cardiac output.
C. Anxiety.
D. Acute pain.

一般认为，城乡二元经济结构是指( )。

A．传统部门比重过大

B．现代经济部门发展不足

C．城乡差距十分明显

D．存在两种不同的资源配置制度