能够综合反映企业数量和规模这两个决定市场结构的市场集中度的衡量指标是 ( )。

A．行业集中度

B．洛伦兹曲线

C．基尼系数

D．勒纳指数

He is () drinker, who has been imbibing for so long that he has figuratively speaking, grown old with the vice.

A. an inveterate

B. an incorrigible

C. a chronic

D. an unconscionable