According to a recent U.S. survey, children spent up to 25 hours a week _________ TV.[    ]

A. to watch      

B. to watching    

C. watching          

D. watch

男．6岁，髋部疼痛、跛行半年，结合图像．最可能的诊断足（）

A.髋关节结核

B.股骨头骨骺缺血坏死

C.骨肉瘤

D.骨囊肿

E.软骨肉瘤