温饱问题解决以后，广大人民群众对健康的需求成为第一需求。针对当前社会高度关注、人民群众的反映比较强烈的医疗卫生领域中的问题，党中央明确提出，要深化医疗卫生体制改革，合理配置医疗卫生资源，整顿药品生产和流通秩序，认真研究并逐步解决群众看病难看病贵问题。请运用所学的知识，谈谈如何逐步解决群众看病难看病贵问题。

If a smooth curve is to represent a probability density function, what two requirements must be satisfied The :（）

A. area under the curve must be zero and the curve must not fall below the horizontal axis.

B. area under the curve must be one and the curve must not rise above the horizontal axis.

C. total area under the curve must be one and the curve must not fall below the horizontal axis.