— Whom would you like to be your assistant, Jack or David?

— If I had to choose, David would be _____ choice. [ ]

A. good

B. better

C. the better

D. the best

关于骨软骨瘤的构成，叙述正确的是（）

A.肿瘤中含有骨、软骨成分

B.肿瘤中仅含有骨成分

C.肿瘤中仅含有软骨成分

D.肿瘤中不含有骨、软骨成分

E.肿瘤由异常生长的正常骨和软骨帽组成