Having a trip abroad is certainly good for the old couple, but it remains _______ whether they will enjoy it.

A．to see

B．to be seen

C．seeing

D．seen

当x∈（1，+∞）时函数y=x^α的图象恒在直线y=x的下方，则α的取值范围是[ ]

A.0＜α＜1

B.α＜0

C.α＜1且α≠0

D.α>1