Finally we decided to fly to France for the winter holiday on our first stop, ________ we planned to  stay for three days.

A．when

B．there

C．which

D．where

增强通常不明显的肿瘤是（）

A．低级别星形细胞瘤 

B．生殖细胞瘤 

C．垂体瘤 

D．转移瘤 

E．脑膜瘤