—What does Yao Ming look like?        

—__________________.      [ ]

A. He comes from China.    

B. He has long arms.          

C. He's 30.

下列哪种组织器官放射耐受量≤4000C、gy/4周~5000C、gy、5周（）

A、大脑各叶 

B、脑干 

C、脊髓 

D、视神经 

E、晶体