关于骨质疏松症特点的叙述错误的是（）
A.单位体积内骨组织数量减少
B.骨皮质变薄
C.骨小梁数量减少
D.髓腔变窄
E.骨脆性增加
参考答案：D
The public _____ generous in their contributions to the earthquake victims. [ ]
a. is
b. was
c. are
d. has been
