公共关系意识的核心是______。
A．服务公众的意识
B．塑造形象的意识
C．真诚互惠的意识
D．沟通交流的意识
参考答案：B
In The Principles of Language Study (1921), Palmer put forward nine fundamental principles of good language teaching and learning, of which ______ was the first and most important.
A．reinforcement and response
B．habit-formation
C．form and meaning
D．meaning and situation
超声发现胆总管呈梭形或圆形扩张时，应首先考虑（）。
A.胆总管下段梗阻
B.胆总管炎
C.胆总管囊肿
D.胆总管癌
E.胆总管结石
