—You fly the kites very well.  

—Thank you. I________ kites when I was 7 years old.[ ]

A. can flew    

B. could flew  

C. can fly    

D. could fly

正常成人垂体平均大小及重量约为（）

A.0.5cm×0.5cm×0.2cm/250mg

B.0.8cm×0.8cm×0.3cm/450mg

C.1.2cm×1.0cm×0.5cm/750mg

D.1.5cm×1.2cm×1.0cm/950mg

E.2.0cm×1.5cm×1.2cm/1250mg