It's less expensive to buy goods in ________,  but you'd better examine the ________ before buying

them. [ ]

A. quantity; quality  

B. quantity; quantity

C. quality; quality  

D. quality; quantity

下列哪种是引起慢性肾功能不全的最常见疾病（）

A.慢性肾小球肾炎

B.慢性肾盂肾炎

C.糖尿病肾病

D.高血压肾动脉硬化

E.系统性红斑狼疮