关于骨质疏松症叙述不正确的是（）。

A.氟化剂可刺激成骨细胞活性，促进骨形成

B.骨密度检查一般需半年以上才能发现动态变化

C.骨密度的定量测定部位为桡骨和尺骨中近1／3交界处

D.Ⅱ型骨质疏松症（老年性骨质疏松症）主要选用骨形成促进剂

E.Ⅰ型骨质疏松症（绝经后骨质疏松症）主要选用骨吸收的抑制剂

The party was meant to be a surprise to everyone who would take part, but one of the

organizers____ the plan. [ ]

A. gave away        

B. gave out        

C. gave up        

D. gave back