从岸上看水中的物体时，会感到水中物体的位置比实际位置高一些，这是光的______现象，从岸上向水中看时，能看到岸边的树木在水中的倒影，这是光的______现象．

China is becoming stronger and stronger.  It is no longer_________ .  [ ]

A. what it used to be              

B. what it was used to being  

C. what it used to being           

D. what it was used to be