The teacher didn't begin the class _____ all the students _____. [ ]

A. until, stopped to talk

B. before, stopped to talk

C. when, stopped talking

D. until, stopped talking

下图为眼球的基本结构图，请据图回答下列问题：

(1)看不同距离的物体时，[ ]__________的曲度会发生改变，从而使物像落在_______上。

(2)从暗室走到阳光下，瞳孔会__________，从而使较少的光线进入眼睛，保护视网膜不受强光刺激。