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