The teacher apologized          late.

A．to his students to arrive

B．to his students for arriving

C．at his students to arrive

D．at his students for arriving

下列哪种现象属于生物的生长现象  [ ]

A．人在离开路灯行走时，影子越来越长    

B．春暖花开时，杨树的树干越长越短  

C．随着环境的变化，沙漠的面积越来越大 

D．工人筑路时，路面越来越宽