Just as the tree is the unit of a forest and the book the unit of a library, ______ the molecule is the unit of matter.

A．as

B．like

C．so

D．thus

关于近视眼患者配戴近视镜，下列叙述正确的是（　　）

A．使进入瞳孔的光线减少

B．可调节晶状体的曲度变小

C．使眼球的前后径变小

D．使物像后移至视网膜