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

配戴渐变焦镜片配戴者看近被迫俯头，证实（）。

A、近附加光度欠正过负

B、双近附加光度不平衡

C、近附加光度过正欠负

D、近光心距有误