已知函数y=loga(2-ax)在(-1，1)上是x的减函数，则a的取值范围是（ ）。
胃与十二指肠病人外科治疗的绝对适应症是（）
A.年轻的溃疡病患者
B.并发瘢痕性幽门梗阻
C.并性水肿性幽门梗阻
D.症状轻的十二指肠球部溃疡
E.大便隐血阳性
The actress looked so charming in the beautiful Vera Wang dress that photographers took _______ pictures of her.
A．a great many
B．mass of
C．the number of
D．a large amount of
