When Mom looked back on the early days of their marriage, she wondered how they had managed

with ________ money. [ ]

A. so few  

B. such few

C. so little 

D. such little

老年人骨密度的高低主要由以下哪几种因素决定（）

A.骨成熟期所能达到的峰值骨密度

B.血清碱性磷酸酶浓度

C.达到峰值后骨质丢失的速度

D.血清钙浓度

E.尿钙浓度