平均利润是通过（）形成的。
A.部门内部的竞争
B.部门之间的竞争
C.技术进步
D.资本有机构成提高
参考答案：B
男性，50岁。咳嗽伴声音嘶哑3个月，右锁骨上窝触及一个肿大的淋巴结，质硬无压痛。提示该患者的诊断可能是（）
A.喉炎
B.肺癌
C.胃癌
D.鼻咽癌
E.肺结核
An analyst does research about well-function financial systems. In a well-functional securities market, if the prices of the assets and contracts reflect all available information related to fundamental values, the financial systems are best described as:（）
A. complete markets.
B. operationally efficiency.
C. informationally efficiency.
